Allow space in regex javascript. How do I create a re May 28, 2019 · 0 I'm fairly new to RegEx's and am having some issues getting my RegEx to do what I'd like it to. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. Regular Expression (Regex) to accept only Alphabets and Space in TextBox using JavaScript The following HTML Markup consists of a TextBox, a Button and an HTML SPAN. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. trim() == '' is saying "Is this string, ignoring space, empty?". To achieve this, we can use a RegEx expression that matches all the characters except a number or an alphabet in JavaScript. Learn how to construct a regex pattern that permits only alphabets and spaces, while ensuring no spaces at the beginning or end of the string. Properly understanding regular expressions will make you a more effective programmer. However, it's not equivalent - \s will include any whitespace character, including tabs, non-breaking spaces, half-width spaces and other characters, whereas a literal space will only match the regular space character. when the text is written Ex : S. It length should be from 5 to 25 characters. Jun 24, 2016 · I need validation for Full name text box which should avoid numeric and special characters, but allow space between words. Aug 16, 2017 · Regex to allow alphanumeric, spaces, some special characters Asked 8 years, 2 months ago Modified 8 years, 2 months ago Viewed 30k times Mar 31, 2023 · Regular expressions (RegEx or RegExp for short) are a sequence of characters that define a search pattern. I need it to check to see if the string is either entirely whitespace (empty) or if it only contains positive whole numbers. ^[^\s]. Regular Expressions A Regular Expression is a sequence of characters that forms a search pattern. ", "*", "+", "?", and more. The field should only allow alphanumeric characters, dashes and underscores and should NOT allow spaces. Remarks \s is a common metacharacter for several RegExp engines, and is meant to capture whitespace characters (spaces, newlines and tabs for example). Jan 21, 2021 · Which means that if users accidentally have a trailing or leading space in that address (e. There should not be any limitation on the characters you can use for a password. The most common forms of whitespace you will use with regular expressions are the space (␣), the tab (\t), the new line (\n) and the carriage return (\r) (useful in Windows environments), and these special characters match each of their respective whitespaces. Valid length is 0 - 60 characters. Jul 8, 2025 · A regular expression (regex for short) allow developers to match strings against a pattern, extract submatch information, or simply test if the string conforms to that pattern. For alphanumeric i am using '^[a-zA-Z0-9]+$' Can anyone he Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. The problem involves putting a space after your email address. g. Jul 11, 2016 · Ok, so I needed an email validator with Javascript. May 19, 2015 · You can optionally have some spaces or underscores up front, then you need one letter or number, and then an arbitrary number of numbers, letters, spaces or underscores after that. In this blog post, we will explore how to use regex in JavaScript to match strings that contain only alphabets or alphanumeric characters (i. let re1 = new RegExp("abc"); let re2 = /abc/; Jun 5, 2019 · 10 This RegEx will allow neither white-space at the beginning nor at the end of your string/word. Jun 2, 2018 · This solution works, but what the regex is doing is it is selecting the whole string and replacing with the trimmed string. I need a expression in jquery which allows only character or space between two words. These are the most common: String Methods RegExp Methods Browser Support /\s/ is an ECMAScript1 (JavaScript 1997) feature. Tha I thought you wanted just the string without any spaces at the beginning or end. But if i want to have a password like ag90:"jNn;fsi. You're also not guaranteed for trim to be defined via a regex, a lot of JS engines have it built-in. However, the code below allows spaces. Regex whitespace special characters in regular expressions refer to characters that represent a space, tab, or newline. What I have for now is: ^[a-zA-Z0-9-. I am using this RE string var numbers =/^[0-9]+$/; This expresion does not allow spaces in the text box. So, I used the code from this StackOverflow answer. Nov 23, 2024 · While this snippet intends to allow designated characters, it incorrectly enables spaces because the regex is set to match only a single character (thanks to using the ^ and $ anchors without the + quantifier). I want to use this in a multiline variable called "item_short_description". What you do with the result inside the statement or if you want to switch the statement to !==, and if you write it to console even only for testing or development - does this really matter? Feb 27, 2024 · Regular expressions, also known as regex, are powerful tools for pattern matching and text manipulation. Note that it should also display error if name contains numbers. +[^\s]$ Any string that doesn't begin or end with a white-space will be matched. I don't think so, he want's to find fields composed of only spaces, so I wrote a check to find it. Using RegEx allows us to easily detect the presence of white spaces and deal with them as needed. Full RegExp Flag Reference Revised July 2025 Flags can be added to a regexp pattern to Modify its behavior: 12 hours ago · In JavaScript, regular expressions (regex) provide a powerful and efficient way to solve this problem. (In JavaScript strings, \\ represents a single backslash!) May 2, 2023 · Regular expressions (regex) are powerful tools in JavaScript that allow you to match and manipulate text based on specific patterns. Spaces and Letters or alphabets-only validation in JavaScript is used to make sure that all the characters entered in the specified field must be any character from A-Z or a-z or white space. We can use different RegEx to achieve this: \s Will take a single whitespace character, but when dealing with line jumps and text Aug 19, 2015 · I am looking for a regular expression that prevents special characters and only allows letters, numbers, dash (-), underscore (_) an space. Saying foo. -]+ # match 1 or more of a word character or DOT or hyphen )* # close the non-capturing Feb 21, 2018 · I am struggling to come up with JS that doesn’t allow special characters and no spacing on one particular field. You can use them to search, replace, and validate the strings of a text in a wide variety of applications, such as text editors, developer too Oct 8, 2021 · Okay, but the (?!\s) is completely pointless, the first \d should be moved into the [a-z] near the end of the regex, and there is no need for the surrounding (). Sep 2, 2023 · Easy Guide to Creating a JavaScript Regular Expression for Alphanumeric Characters Are you struggling to find the perfect regular expression (regex) in JavaScript that allows only alphanumeric characters without requiring both a letter and a number? You're not alone! Many developers face this common issue when trying to validate user input or text fields. Regular expressions are used in many programming languages, and JavaScript's syntax is inspired by Perl. when copy/pasting), the expression validates to false. Match a Word The pattern /hello/ matches the string "hello" in the input string "hello world". [A-Za-z0-9@!#$% &* ()_+-=//. And also do not start with a space. ). NET, Rust. Thanks. If you want to allow multiple spaces between words (say, if you'd like to allow accidental double-spaces, or if you're working with copy-pasted text from a PDF), then add a + after the space: ^\w+ ( +\w+)*$ If you want to allow tabs and newlines (whitespace characters), then replace the space with a \s+: ^\w+ (\s+\w+)*$ Here I suggest the + by default because, for example, Windows linebreaks Feb 24, 2016 · I have used a regex which allows the user to enter alphanumeric values like ABC123, xyz321 but now what I want is with these characters, it is not allowing me to enter space between some characte Aug 19, 2016 · You can use this regex instead to allow space only in middle (not at start/end): var rx = /^[\w. In JavaScript, regular expressions are also objects. I want to be able to enter spaces () but continue to disallow special characters. Here, we will explore various examples demonstrating the utility of RegExp in JavaScript. Trying to check input against a regular expression. Thank you for your feedback but this regex enforces the common practice of not allowing spaces as the first character in a "college name" for better user experience. Submitted by Rama Krishna - 9 years ago (Last modified 2 years ago) It will allow anything inside square brackets, so let's say you want to allow any other character, for example, "/" and "#", the regex would be something like this: Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. It is perfectly legal to include a literal space in a regex. Check your engines documentation to be sure about this. also, I have to restrict some special characters at the beginnin Mar 27, 2020 · @ code maniac im writing the validation message if the user is giving space in the begining and ending . The requirement is to allow spaces at the beginning of a string if the string is non-empty. If you want to allow multiple spaces between words (say, if you'd like to allow accidental double-spaces, or if you're working with copy-pasted text from a PDF), then add a + after the space: ^\w+ ( +\w+)*$ If you want to allow tabs and newlines (whitespace characters), then replace the space with a \s+: ^\w+ (\s+\w+)*$ Here I suggest the + by default because, for example, Windows linebreaks Oct 8, 2012 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Moved PermanentlyThe document has moved here. run (used g flag for all occurrences) The underscore belongs to word characters [A-Za-z0-9_] and needs to be matched separately. Jan 23, 2013 · My regular expression which allows characters, numbers, dot and underscore is var numericReg = /^[a-zA-Z0-9\. . Jun 13, 2023 · In JavaScript, you can use regular expressions (regex) to work with space characters. Creating a regular expression in JavaScript to validate names that only allow letters and spaces can be achieved using a pattern that matches upper and lower case letters as well as spaces. Yes, the regex is simple, but it's still less clear. so im looking for the correct regex code where it match my requirement, (Im not familiar with the regex ). Whether you're validating user input, extracting data from strings, or performing advanced text processing tasks, understanding regex is essentia Apr 28, 2025 · Using regex with the input event In this approach, we will use the regular expression with the input event that checks the correctness of the entered input at the same time and write the respective text for the same. I have not been successful in finding a way to neaten it up to [A Jun 28, 2022 · Search, filter and view user submitted regular expressions in the regex library. You could alternatively use \S to denote the same. Explanation: ^ denotes the beginning of the string. ,";: {}|etc etc] for example, is so ugly but it works to exclude spaces from a password validation while allowing other special characters, letters, and numbers. function ffchecken (form) { v Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. And why didn't you include the support for the whitespace at the end of the regex? Mar 18, 2024 · Need a regex to allow all characters and spaces, but no lower case letters. Feb 12, 2014 · I'm trying to write a regular expression to remove white spaces from just the beginning of the word, not after, and only a single space after the word. In contrast enclosing whole regex with beginning of input string and end of input string anchors (^ & $) means an exact match which starts from beginning and should finish at the end of input string otherwise it fails. PS: You don't need to escape most of the special regex symbols inside character class as shown in my example. The RegEx needs to allow spaces, and empty strings. Sep 2, 2023 · To allow spaces between words, we need to modify our regular expression. -]+)*$/gm; RegEx Demo RegEx Breakup: ^ # line start [\w. RegExp are be used for: Text searching Text replacing Text validation Dec 28, 2018 · Regular Expression (Regex) to exclude (not allow) Special Characters in JavaScript When the Button is clicked, the Validate JavaScript function is called. The space character itself can be represented in regex using the \s metacharacter. I want a regular expression that prevents symbols and only allows letters and numbers. Jul 14, 2021 · I want to create a RegExp in javascript. The most restriction there should be is a quota for what types of characters must appear. This regex also allowed 1 optional space after digits also. This includes the space character itself, as well as the tab character (\t) and the newline character (\n). I need a first name regex that accepts letters and the following special characters. val Feb 19, 2016 · Just add a space or \s (to allow any space character like tab, carriage return, newline, vertical tab, and form feed) in the character class ^[a-zA-Z ]+$ Note: This will allow any number of spaces anywhere in the string. so whenver user giving space in the ending and begining the validation message occurs. Nov 18, 2016 · 0 If you just do not want to allow a space at the start, and allow it and other chars you allow after it, and be able to match a 1-char string, use ^[a-zA-Z-][a-zA-Z -]*$ See the regex demo Oct 19, 2012 · Did you mean to use (?:\s)? Just so you know, it won't include the space in the match, if the string matches (just pointing it out). IMHO, this shows the intent of the code more clear than a regex. -]+(?:[ \t]+[\w. I tried Googling but wasn't able to find that. Sep 2, 2023 · Are you tired of struggling with regular expressions that just don't give you the flexibility you need? 🤔 Don't worry, I've got your back! In this blog post, I'll show you a simple solution to allow spaces between words in your regex. Jul 21, 2025 · Regular expressions are patterns used to match character combinations in strings. I'm trying to validate using jQuery Validator if input only contains spaces, and allow space only if there's a letter inside it. Used RegExp: var re = new RegExp(/^([a-zA-Z Javascript regex - no white space at beginning + allow space in the middle Asked 11 years, 10 months ago Modified 4 years, 2 months ago Viewed 91k times I have a username field in my form. Solution 1: Correcting the Regex for Multi-character Input To properly validate strings of more than one character, include the + quantifier after your character class: Apr 12, 2024 · A regular expression (regex) is a sequence of characters that define a search pattern. For help making this question more broadly applicable, visit the help center. Regular Expression Groups (aka capturing groups) allows parts of a matched string to be extracted and reused. It provides a brief overview of each Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Choose a programming language or tool that supports regex, such as Python, Perl, or grep. Here's how to write regular expressions: Start by understanding the special characters used in regex, such as ". Regular Expression Methods Regular Expression Search and Replace can be done with different methods. I want to not allow spaces anywhere in the string. e. RegEx Demo If you want to allow only a single space between first name and last name. Note: it probably won't capture all the unicode space characters. It is supported in all browsers: Jan 2, 2018 · explained with an example, how to use Regular Expression (Regex) to allow only Numbers (Digits) and Space character in JavaScript and jQuery. -]+ # match 1 or more of a word character or DOT or hyphen (?: # start a non-capturing group [ \t]+ # match one or more space or tab [\w. JavaScript RexExp is an Object for handling Regular Expressions. Instead of only allowing letters, numbers, and underscores, we'll add a space character as well. The one that r/humbertcole posted will only match lines that have no spaces at the beginning or end. \s denotes white-spaces and so [^\s] denotes NOT white-space. For example if I enter strings such as "This is a test" or "testing", the regular expression should pass validation. It can be either constructed with the RegExp constructor or written as a literal value by enclosing a pattern in forward slash (/) characters. So I want to allow trailing and leading spaces on the above expression. 1. I have used this regex: var regexp = /^\\S/; This works for me if there are spaces between the characters. But fret not, because we've got you Nov 15, 2012 · I need help with regular expression. Aug 5, 2020 · I am searching for a regular expression for allowing alphanumeric and spaces in JavaScript. By the way \b being a backspace in character classes is not unique to JavaScript, but interpreted this way in most regex flavors. I think this has something to do with Regex but I don’t fully understand. -, ', . Is there a regex for selecting just the beginning and ending spaces and removing them? Feb 23, 2013 · I have very big difficulties to find a regex for string with spaces (it can use every letter and number). and whitespace However, it must NOT let the name be made up of Oct 12, 2023 · This tutorial shows us a Regular Expression (RegEx) that allows only alphanumeric characters using JavaScript. Aug 5, 2025 · The \s metacharacter in JavaScript regular expressions matches any whitespace character. no double space allowed I am using this Jun 22, 2014 · 2. Here's a simple regex pattern for this purpose: /^ [A-Za-z\s]+$/ Regular Expression (RegEx) for whitespaces Dealing with spaces is a common action when receiving data from our apps, that's why we need to learn how to detect them. , alphabets and numbers), but not only numbers. This regex pattern matches strings that contain only letters (both uppercase and lowercase) and spaces. Creating a regular expression A regular expression is a type of object. Jul 25, 2009 · I need to match a single character that is anything but a space but I don't know how to do that with regex. If I enter example@gmail. Dec 2, 2018 · 2 I need regular expression to not allow only whitespaces in a field (the user should not enter just whitespaces in the field) but it can allow completely empty field and it can also allow string with whitespaces in between. May 23, 2017 · In a RegEx I need to allow spaces only in middle and prevent spaces at beginning and end Asked 8 years, 5 months ago Modified 8 years, 5 months ago Viewed 634 times Nov 9, 2011 · This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. Over 20,000 entries, and counting! Jan 29, 2017 · How can I reject leading space and ending space and allow only one space between characters in JavaScript ? Sep 13, 2021 · please help! I've been at this for hours. (2) When using the RegExp constructor: for each backslash in your regular expression, you have to type \\ in the RegExp constructor. At the moment this prevents special characters from being entered in the textfield. Further reading: In first regular expression you are doing a partial match since no exact match is considered. I am using a regular expression to make sure that I only allow Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Harish Kumar Check the regEx that I h Jul 14, 2010 · Can someone help me create this regex. com, May 12, 2017 · Hello I'm trying to write a regular expression for user name in my form. This chapter describes JavaScript regular expressions. This regex works great but it doesn't allow for spaces between words. Regex is a common shorthand for a regular expression. This blog will guide you through creating a regex pattern to detect special characters, explaining the logic step-by-step and addressing advanced scenarios and common pitfalls. _]+$/; How could i allow backspace in this reg ex. ^[a-zA-Z]+(?:\s[a-zA-Z]+)?$ ^: Start of the line anchor [a-zA-Z]+: Match one or more Jul 3, 2013 · For instance, check out a Unicode converter, enter the JavaScript input abc\b\bdef in the bottom left input, hit "convert", and the "Characters" output will not have the bc erased. This includes spaces, tabs, form feeds, line breaks, and other whitespace characters as defined in Unicode. It How can I match a space character in a PHP regular expression? I mean like "gavin schulz", the space in between the two words. ^ asserts the start of the string, [a-zA-Z] matches any letter, \\s matches any whitespace character (in this case, space), + allows for one or more occurrences of the previous characters, and $ asserts the end of the string. Inside the Validate JavaScript function, the value of the TextBox is tested against the Regular Expression Alphabets and Numbers (AlphaNumeric) characters with Space. Aug 5, 2025 · Regular Expressions in JavaScript provide robust pattern-matching capabilities that are useful for validating input, searching and replacing text, and more. Open regex in editor Description This will allow only one space after a word. I'm attempting to create a RegEx that prevents any special character OTHER THAN single quote ('), dash (-), and period (. The current regex allows string to start with white space, same with comma. Stop it. ? Oct 8, 2022 · To match anything that is not a word character nor a whitespace character (cr, lf, ff, space, tab) const specialCharsRegex = new RegExp(/[^\w\s]+|_+/, 'g'); See this demo at regex101 or a JS replace demo at tio. The regex below works great, but it doesn't allow for spaces between words. ]*$ Aug 6, 2022 · let hello = " Hello, World! "; let wsRegex = /^\S*\s*\S*$/g; Your regular expression is saying: At the beginning of the string match a non-whitespace character zero or more times Then, match a whitespace character zero or more times And at the end of the string match a non-whitespace character zero or more times global flag activated (return all possible matches) Your hello string begins with Learn how to create an HTML5 form validation pattern for alphanumeric input with spaces using regular expressions and JavaScript. The regular expression should allow spaces and . match(/^\s*$/) is asking "Does the string foo match the state machine defined by the regex?". They are created by enclosing a pattern within parentheses (): Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Wondering if there is a clean way to do this where you could use \W instead of spelling out every one of the allowed special characters. /, why shouldn't that be allowed? Mar 21, 2013 · I want to validate 'int' field with javascript regular expression. See my JavaScript code here: function jsPreventNumeric(obj) { obj. but i need to allow other characters including special characters. Help! Nov 4, 2014 · From what I can infer, the only requirement you're not getting right is white space between words. So as soon as a match is found engine is satisfied. nu7zf un gbfzq23 jaqw5f 3bi 9gzoixl jf a9sux wm2npn p9c