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.
Its syntax is as follows −
RegExpObject.source
Returns the text used for pattern matching.
Try the following example program.
<html> <head> <title>JavaScript RegExp source Property</title> </head> <body> <script type="text/javascript"> var str = "Javascript is an interesting scripting language"; var re = new RegExp( "script", "g" ); re.test(str); document.write("The regular expression is : " + re.source); </script> </body> </html>
The regular expression is : script