JavaScript | RegExp \b Metacharacter
The RegExp \b Metacharacter in JavaScript is used to find a match at the beginning or end of a word. If 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 “GeeksforGeeks” at the beginning of the string.
<!DOCTYPE html> <html> <head> <title> JavaScript RegExp \b Metacharacter </title> </head> <body style="text-align:center"> <h1 style="color:green"> GeeksforGeeks </h1> <h2>RegExp \b Metacharacter</h2> <p>Input String: GeeksforGeeks@_123_$</p> <button onclick="geek()"> Click it! </button> <p id="app"></p> <script> function geek() { var str1 = "GeeksforGeeks@_123_$"; var regex4 = /\bgeeksforgeeks/gi; var match4 = str1.match(regex4); document.getElementById("app").innerHTML = "Found " + match4.length + " match: " + match4; } </script> </body> </html> |
chevron_right
filter_none
Output:
Before Clicking the button:
After Clicking the button:
Example 2: This example matches the word “Geeky” at the beginning and replaces it with the word “GFG”.
<!DOCTYPE html> <html> <head> <title> JavaScript RegExp \b Metacharacter </title> </head> <body style="text-align:center"> <h1 style="color:green"> GeeksforGeeks </h1> <h2>RegExp \b Metacharacter</h2> <p>String: Geeky@128</p> <button onclick="geek()"> Click it! </button> <p id="app"></p> <script> function geek() { var str1 = "Geeky@128"; var regex4 = new RegExp("\\bGeeky", "gi"); var replace = "GFG"; var match4 = str1.replace(regex4, replace); document.getElementById("app").innerHTML = " New string: " + match4; } </script> </body> </html> |
chevron_right
filter_none
Output:
Before Clicking the button:
After Clicking the button:
Supported Browsers: The browsers supported by RegExp \b Metacharacter are listed below:
- Google Chrome
- Apple Safari
- Mozilla Firefox
- Opera
- Internet Explorer
