The RegExp \b Metacharacter in JavaScript is used to find a match at the beginning or end of a word. If a match is found it returns the word else it returns NULL.
Syntax:
/\b/
or
new RegExp("\\b")
Syntax with modifiers:
/\b/g
or
new RegExp("\\b", "g")
Example 1: This example matches the word “neveropen” at the beginning of the string.
Javascript
function geek() { let str1 = "neveropen@_123_$"; let regex4 = /\bneveropen/gi; let match4 = str1.match(regex4); console.log("Found " + match4.length + " match: " + match4);}geek(); |
Found 1 match: neveropen
Example 2: This example matches the word “Geeky” at the beginning and replaces it with the word “GFG”.
Javascript
function geek() { let str1 = "Geeky@128"; let regex4 = new RegExp("\\bGeeky", "gi"); let replace = "GFG"; let match4 = str1.replace(regex4, replace); console.log(" New string: " + match4);}geek(); |
New string: GFG@128
Supported Browsers: The browsers supported by RegExp \b Metacharacter are listed below:
- Google Chrome
- Apple Safari
- Mozilla Firefox
- Opera
- Internet Explorer
We have a complete list of Javascript RegExp expressions, to check those please go through this JavaScript RegExp Complete Reference article.
We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.