- JavaScript Basics
- JS Home
- JS Syntax
- JS Placements
- JS Output
- JS Statements
- JS Keywords
- JS Comments
- JS Variables
- JS var
- JS let
- JS const
- JS var Vs let Vs const
- JS Operators
- JS Arithmetic Operators
- JS Assignment Operators
- JS Comparison Operators
- JS Logical Operators
- JS Bitwise Operators
- JS Ternary Operator
- JS Operator Precedence
- JS Data Types
- JS typeof
- JS Conditional Statements
- JS Conditional Statement
- JS if Statement
- JS if...else Statement
- JS switch Statement
- JS Loops
- JS for Loop
- JS while Loop
- JS do...while Loop
- JS break Statement
- JS continue Statement
- JS break Vs. continue
- JavaScript Popup Boxes
- JS Dialog Box
- JS alert Box
- JS confirm Box
- JS prompt Box
- JavaScript Functions
- JS Functions
- JS setTimeout() Method
- JS setInterval() Method
- JavaScript Events
- JS Events
- JS onclick Event
- JS onload Event
- JS Mouse Events
- JS onreset Event
- JS onsubmit Event
- JavaScript Arrays
- JS Array
- JS Find Length of Array
- JS Add Elements at Beginning
- JS Add Element at End
- JS Remove First Element
- JS Remove Last Element
- JS Get First Index
- JS Get Last Index
- JS Reverse an Array
- JS Sort an Array
- JS Concatenate Arrays
- JS join()
- JS toString()
- JS from()
- JS Check if Value Exists
- JS Check if Array
- JS Slice an Array
- JS splice()
- JS find()
- JS findIndex()
- JS entries()
- JS every()
- JS fill()
- JS filter()
- JS forEach()
- JS map()
- JavaScript Strings
- JS String
- JS Length of String
- JS Convert to Lowercase
- JS Convert to Uppercase
- JS String Concatenation
- JS search()
- JS indexOf()
- JS search() Vs. indexOf()
- JS match()
- JS match() Vs. search()
- JS replace()
- JS toString()
- JS String()
- JS includes()
- JS substr()
- JS Slice String
- JS charAt()
- JS repeat()
- JS split()
- JS charCodeAt()
- JS fromCharCode()
- JS startsWith()
- JS endsWith()
- JS trim()
- JS lastIndexOf()
- JavaScript Objects
- JS Objects
- JS Boolean Object
- JavaScript Math/Number
- JS Math Object
- JS Math.abs()
- JS Math.max()
- JS Math.min()
- JS Math.pow()
- JS Math.sqrt()
- JS Math.cbrt()
- JS Math.round()
- JS Math.ceil()
- JS Math.floor()
- JS Math.trunc
- JS toFixed()
- JS toPrecision()
- JS Math.random()
- JS Math.sign()
- JS Number.isInteger()
- JS NaN
- JS Number()
- JS parseInt()
- JS parseFloat()
- JavaScript Date and Time
- JS Date and Time
- JS Date()
- JS getFullYear()
- JS getMonth()
- JS getDate()
- JS getDay()
- JS getHours()
- JS getMinutes()
- JS getSeconds()
- JS getMilliseconds()
- JS getTime()
- JS getUTCFullYear()
- JS getUTCMonth()
- JS getUTCDate()
- JS getUTCDay()
- JS getUTCHours()
- JS getUTCMinutes()
- JS getUTCSeconds()
- JS getUTCMilliseconds()
- JS toDateString()
- JS toLocaleDateString()
- JS toLocaleTimeString()
- JS toLocaleString()
- JS toUTCString()
- JS getTimezoneOffset()
- JS toISOString()
- JavaScript Browser Objects
- JS Browser Objects
- JS Window Object
- JS Navigator Object
- JS History Object
- JS Screen Object
- JS Location Object
- JavaScript Document Object
- JS Document Object Collection
- JS Document Object Properties
- JS Document Object Methods
- JS Document Object with Forms
- JavaScript DOM
- JS DOM
- JS DOM Nodes
- JS DOM Levels
- JS DOM Interfaces
- JavaScript Cookies
- JS Cookies
- JS Create/Delete Cookies
- JavaScript Regular Expression
- JS Regular Expression
- JS RegEx .
- JS RegEx \w and \W
- JS RegEx \d and \D
- JS RegEx \s and \S
- JS RegEx \b and \B
- JS RegEx \0
- JS RegEx \n
- JS RegEx \xxx
- JS RegEx \xdd
- JS RegEx Quantifiers
- JS RegEx test()
- JS RegEx lastIndex
- JS RegEx source
- JavaScript Advance
- JS Page Redirection
- JS Form Validation
- JS Validations
- JS Error Handling
- JS Exception Handling
- JS try-catch throw finally
- JS onerror Event
- JS Multimedia
- JS Animation
- JS Image Map
- JS Debugging
- JS Browser Detection
- JS Security
- JavaScript Misc
- JS innerHTML
- JS getElementById()
- JS getElementsByClassName()
- JS getElementsByName()
- JS getElementsByTagName()
- JS querySelector()
- JS querySelectorAll()
- JS document.write()
- JS console.log()
- JS instanceof
- JavaScript Programs
- JavaScript Programs
JavaScript \w and \W Metacharacters | What is w and W in RegEx?
This post is published to define the two metacharacters that are used while working with JavaScript regular expression. That are:
Notice the case, that is, the first \w contains w which is in lowercase. Whereas the second \W contains W, which is in uppercase.
The \w Metacharacter
The \w metacharacter is used when we need to match all word characters.
Now the question is, what does it mean by word characters?
The answer to this question is: Any alphanumeric including _ (underscore) characters are word
characters. That is, a-z, A-Z, 0-9, and _ are all word characters.
Here is an example demonstrating the \w metacharacter:
<!DOCTYPE html> <html> <body> <p id="xyz"></p> <script> let myString = "Hey, I got 100% marks in Mathematics!"; let pattern = /\w/gi; document.getElementById("xyz").innerHTML = myString.match(pattern); </script> </body> </html>
All non-word characters such as comma (,), span, percentile (%), and exclamation mark (!) are excluded in the output.
Note: The match() method is used to match a string with/using a regular expression.
The \W Metacharacter
Unlike \w, the \W metacharacter is used when we need to match all characters except word characters. For example:
<!DOCTYPE html> <html> <body> <p id="xyz"></p> <script> let mystr = "That's Good!"; let ptrn = /\W/gi; document.getElementById("xyz").innerHTML = mystr.match(ptrn); </script> </body> </html>
« Previous Tutorial Next Tutorial »