Substring is found, but regex fails

Question

Suppose I have some string, and run the following tests on it:

response.indexOf("</p:panelGrid>");
response.matches(".*</p:panelGrid>.*");

How is it possible that indexOf finds the substring (it does not return -1), but the regular expression in the second test does not match?

I have come across this problem while trying to write a test that checks if taglibs are rendered correctly in JSF with Pax Web. I have not been able to reproduce this behavior outside of this test.

You probably have escape characters.

Random42
– Random42

2012-08-22 12:11:50 +00:00
Commented Aug 22, 2012 at 12:11 — Random42
– Random42, Commented Aug 22, 2012 at 12:11
Provide a String that exhibits such behavior.

Marko Topolnik
– Marko Topolnik

2012-08-22 12:12:11 +00:00
Commented Aug 22, 2012 at 12:12 — Marko Topolnik
– Marko Topolnik, Commented Aug 22, 2012 at 12:12

Björn Pollex · Accepted Answer · 2012-08-22 12:36:12Z

7

The . matches everything except for newline characters. You must change your regex string to

"(?s).*</p:panelGrid>.*"

Then it will match always.

edited Aug 22, 2012 at 12:36

Björn Pollex

77.2k30 gold badges206 silver badges290 bronze badges

answered Aug 22, 2012 at 12:14

Marko Topolnik

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