JavaScript RegExp ?! Quantifier
Last Updated :
29 May, 2023
The RegExp ?!m Quantifier in JavaScript is used to find the match of any string which is not followed by a specific string m.
Syntax:
/?!m/
or
new RegExp("?!m")
Syntax with modifiers:
/\?!m/g
or
new RegExp("?!m", "g")
Example 1: This example matches the words ‘Geeks’ not followed by 123 in the whole string.
Javascript
function geek() {
let str1 = "Geeks for 123 Geeks@";
let regex4 = /Geeks(?!123)/g;
let match4 = str1.match(regex4);
console.log("Found " + match4.length
+ " matches: " + match4);
}
geek();
|
Output
Found 2 matches: Geeks,Geeks
Example 2: This example replaces the word ‘128’ with ‘#’.
Javascript
function geek() {
let str1 = "@128Geek128";
let regex4 = new RegExp("128(?!ee)", "gi");
let replace = "#";
let match4 = str1.replace(regex4, replace);
console.log(" New string: " + match4);
}
geek();
|
Output
New string: @#Geek#
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.
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.
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