Java Regex not matching?

Question

I have this code, but it does not seem to be working.

Pattern pattern=Pattern.compile("IMGURSESSION=([0-9a-zA-Z]*);");
Matcher matcher=pattern.matcher("IMGURSESSION=blahblah; path=/; domain=.imgur.com");
System.out.println(matcher.matches());

Would anyone know why?

There is nothing wrong with the regex itself. It worked when I tested it with RegexBuddy. — Nithin Philips
– Nithin Philips, Commented Aug 18, 2011 at 6:08
I know that. I know regex enough to know it will work. And RegexBuddy--40 dollars! Insane! I just stick to gskinner.com/RegExr — Isaac
– Isaac, Commented Aug 18, 2011 at 6:20

Prince John Wesley · Accepted Answer · 2011-08-18 06:05:37Z

8

Matcher#matches() method attempts to match the entire input sequence against the pattern.

Pattern.compile("IMGURSESSION=([0-9a-zA-Z]*);.*$"); //true
Pattern.compile("IMGURSESSION=([0-9a-zA-Z]*);"); //false

answered Aug 18, 2011 at 6:05

Prince John Wesley

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Dragon8 · Accepted Answer · 2011-08-18 06:11:05Z

2

the matches Method match against the entire input string.

if you will match only a subsequence you can use the find() method.

the 3 different ways to match with a matcher are explained in the java docs: http://download.oracle.com/javase/7/docs/api/java/util/regex/Matcher.html

answered Aug 18, 2011 at 6:11

Dragon8

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Sanjay T. Sharma · Accepted Answer · 2011-08-18 06:09:00Z

1

Assuming your aim is to extract the IMGURSESSION:

import java.util.regex.*;

Pattern pattern = Pattern.compile("IMGURSESSION=([0-9a-zA-Z]*);.*");
Matcher matcher = pattern.matcher("IMGURSESSION=blahblah; path=/; domain=.imgur.com");
if (matcher.find()) {
    System.out.println(matcher.group(1));
}

Just make sure you put in a match all pattern at the end to satisfy the "matcher" semantics.

answered Aug 18, 2011 at 6:09

Sanjay T. Sharma

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