JavaScript RegExp ? Quantifier
Last Updated :
29 May, 2023
The m? Quantifier in JavaScript is used to find the match of any string that contains zero or one occurrence of m.
Syntax:
/m?/
or
new RegExp("m?")
Syntax with modifiers:
/\m?/g
or
new RegExp("m?", "g")
Example 1: This example matches the word e followed by zero or one occurrence of k.
Javascript
function geek() {
let str1 = "GeeksforGeeks@_123_$" ;
let regex4 = /ek?/gi;
let match4 = str1.match(regex4);
console.log( "Found " + match4.length
+ " matches: " + match4);
}
geek();
|
Output
Found 4 matches: e,ek,e,ek
Example 2: This example replaces the word 1 followed by zero or one occurrence of 2 with “@”.
Javascript
function geek() {
let str1 = "Geeky#12$#1" ;
let regex4 = new RegExp( "#12?" , "gi" );
let replace = "@" ;
let match4 = str1.replace(regex4, replace);
console.log( " New string: " + match4);
}
geek();
|
Output
New string: Geeky@$@
Supported Browsers: The browsers supported by RegExp ? Quantifier 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.
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