java - Extract a substring by using regex doesn't work -


i have string this:

string source = "https://1116.netrk.net/conv1?prid=478&orderid=[6aa3482b-519b-4127-abee-debcd6e39e96]"

i want extract orderid inside [ ]. wrote method:

public string extractorderid(string source) {     pattern p = pattern.compile("[(.*?)]");     matcher m = p.matcher(source);     if (m.find())         return m.group(1);     else         return ""; }

but exception 

java.lang.indexoutofboundsexception: no group 1

any idea what's wrong? thanks

you need escape brackets:

pattern p = pattern.compile("\\[(.*?)\\]");

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