Java Regex won't match, any explanations?

The regex String :

"[Ff][uU][Nn][Cc] " 

Matches input:

"fUnC " 

But not:

"func across( a, b )"

And I don't understand why...

I'm testing my expressions here: http://www.regexplanet.com/simple/index.html

I figured out that I (dumbly) needed my regex to be "[Ff][uU][Nn][Cc] .*" for a match.

SOLVED: Don't use the convenience method Pattern.Matches(regex, input) if you are looking for what amounts to a submatc开发者_高级运维h. You should use the Matcher.find() method instead.

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When I use the regex tester you link to, I see that your regex works with find(), but not with matches(). This is what I would expect -- find() just looks for a regex hit within the target string, while matches() always tries to match the entire string.

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"[Ff][uU][Nn][Cc].*" may help...

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It can be.... it's working fine. But your strings in there and you'll see MATCHES is false, but replaceFirst and ReplaceAll work fine.

If you want MATCHES to be true

add a * at the end

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Have you also tried using the regex tester, ignoring case? There should be a way to turn on case insensitivity in the Java regex matcher.