simple java regex with backreference does not work -

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i have trouble replace string backreference of regular expression: nothing replaced , end input.
code:

string input="a12.3 bla bla input"; input = stringutils.replacepattern(             input, "^([a-z]\\d{2}\\.\\d)",             "$1"); system.out.println(input);

the main problem can not change java code input, regex , group reference.

do have suggestions other regex pattern matches needs or going wrong?

stringutils of apache commons lang

you replacing same matched pattern itself. meant:

string input="a12.3 bla bla input"; input = stringutils.replacepattern(             input, "^([a-z]\\d{2}\\.\\d).*$", "$1"); //                                      ^^^ system.out.println(input);

.*$ match input till end.


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