Change group using regex java

Question

I need help in regular expression using in regex java.

I need change group in string:

Example:

Input:

=sum($var1;2) or =if($result<10;"little";"big") ...

Need Output:

=sum(teste;2) or =if(teste<10;"little";"big") ...

Code I have:

Pattern p = Pattern.compile("(\\.*)(\\$\\w)(\\.*)");
Matcher m = p.matcher(total);
if (m.find()) {
    System.out.println(m.replaceAll("$2teste"));
}

Output I have:

=sum($vtestear1;2)
=if($r testeesultado<5;"maior";"menor")

fge · Accepted Answer · 2013-06-14 11:18:22Z

1

Why match everything when all you need is to match variable tokens?

Pattern p = Pattern.compile("\\b\\$[a-z0-9]+\\b");
p.matcher(total).replaceAll("teste");

Change the [a-z0-9] part if you can have more than lowercase ASCII letters and digits.

Also, you don't need to test for .find() or anything if you .replace(): no match means nothing will be replaced.

answered Jun 14, 2013 at 11:18

fge

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