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ES6 - RegExp source
source is a read-only string property of RegExp objects. It contains the text of the RegExp pattern. This text does not include the delimiting slashes used in regular-expression literals, and it does not include the "g", "i", and "m" attributes.
Syntax
RegExpObject.source
Return Value
Returns the text used for pattern matching.
Example
var str = "Javascript is an interesting scripting language";
var re = new RegExp( "script", "g" );
re.test(str);
console.log("The regular expression is : " + re.source);
Output
The regular expression is : script
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