How to parse string with regex in Java?

Question

How can I parse such data with Java regex?

data.param[0] 
0 - is any non negavite digit

Here is my try -

String result = Pattern.compile("(data.param[)(\\d+)(])").matcher("data.param[13123]").group();

Answer 1

You can use this regex:

Pattern p = Pattern.compile("data\\.param\\[(\\d+)\\]");
Matcher m = p.matcher("data.param[13123]");

if (m.find())
    System.out.println(m.group(1));