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I’m trying to understand this javascript regular expression.
Can anyone give me an explanation about this regexp parts?
location.href.match(/^http:\/\/(www\.)?example.com/i)
lets break it up in bits:
^http:\/\/= the string has to begin withhttp://. The backslashes are there because if they wouldn’t, the slashes would end the regex pattern.(www\.)?= matcheswww.if it exists (that’s what the question mark is for)example.com= string must be followed withexample.comi= case insensitiveSo these are possible matches:
http://example.comhttp://www.example.comhttp://www.EXAMPLE.COMhttp://www.example.com/some/page/Unfortunately, the regex wouldn’t match the HTTPS protocol. We can use the same method applied to
www.using the question mark:/^http(s)?:\/\/(www\.)?example.com/i