regex pattern in java is not working

Question

I am trying to create a regex pattern to search for a special kind of file names:

A file name may look like this:

fileName_1x1.extension

I want to find if the filename has this pattern:

_(number)x(number).

I pasted the previous path into an online regex generator/tester and it worked with this pattern:

Pattern pattern = Pattern.compile("_\\d(.+)x\\d(.+)\\.");
Matcher matcher = pattern.matcher("fileName_1x1.extension");
return matcher.find();

Why isn't this working in Java?

I don't see why this pattern would work. What tool did you use? — Daniel Kaplan
– Daniel Kaplan, Commented Apr 8, 2015 at 18:00

anubhava · Accepted Answer · 2015-04-08 17:59:11Z

4

It should be this regex:

Pattern pattern = Pattern.compile("_\\d+x\\d+\\.");

You have .+ after \\d which will match any character 1 or more time after a digit.

answered Apr 8, 2015 at 17:59

anubhava

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