regex - Java regular expression is not matching valid results -


this question has answer here:

i'm trying write simple java regular expression extract out video id of given youtube video url. e.g for:

http://www.youtube.com/watch?v=-mzvaauco1c

i want extract out: -mzvaauco1c.

here's i'm trying:

pattern pattern = pattern.compile("v=([^&]+)"); string url = "http://www.youtube.com/watch?v=-mzvaauco1c"; matcher matcher = pattern.match(url); system.out.println(matcher.getgroupcount() ); //outputs 1 system.out.println(matcher.matches() ); //returns false; system.out.println( matcher.group(0) ); //throws exception, same 1

what doing wrong?

invoke find match partial string. dont call matches after calling find - result in illegalstateexception. want capture group 1 rather 0 latter returns full string

pattern pattern = pattern.compile("v=([^&]+)"); string url = "http://www.youtube.com/watch?v=-mzvaauco1c&foo=3"; matcher matcher = pattern.matcher(url); if (matcher.find()) {     system.out.println(matcher.groupcount());      system.out.println(matcher.group(1));  }

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