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Showing content from https://webplatform.github.io/docs/javascript/RegExp/source below:

source · WebPlatform Docs

source Summary

Returns a copy of the text of the regular expression pattern. Read-only. The rgExp argument is a Regular expression object. It can be a variable name or a literal.

Syntax

rgExp.source

Examples

The following example illustrates the use of the source property:

function SourceDemo(re, s){
    var s1;
    
    if (re.test(s))
       s1 = " contains ";
    else
       s1 = " does not contain ";
    
    return(s + s1 + re.source );
 }