javascript - Can someone tell me the purpose of the second capture group in the jQuery rts regular expression? -

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in jeff roberson's jquery regular expressions review proposes changing rts regular expression in jquery's ajax.js /(\?|&)_=.*?(&|$)/ /([?&])_=[^&\r\n]*(&?)/. in both versions, purpose of second capture group? code replacement of current random timestamp new random timestamp: 

var ts = jquery.now(); // try replacing _= if there var ret = s.url.replace(rts, "$1_=" + ts + "$2");

doesn't replace matches? thinking same:

var ret = s.url.replace(/([?&])_=[^&\r\n]*/, "$1_=" + ts);

can explain purpose of second capture group?

it's pick next delimiter in query string on url, still works query string. if url is

http://foo.bar/what/ever?blah=blah&_=12345&zebra=banana

then second group picks "&" before "zebra".

that's awesome blog post way , should read it.

edit — think it, i'm not sure why it's necessary bother replacing second delimiter. in "fixed" expression, greedy * pick whole parameter value , stop @ delimiter (or end of string) anyway.


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