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Java - index of pattern in string using regex

10 points
Created by:
Greg
1505

In java it is possible to get text index of pattern in string using regex in following way.

1. start and end methods example

String regex = "bc";
String text = "aabbcc";

Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(text);

if (matcher.find()) {
    System.out.println("Start index: " + matcher.start());
    System.out.println("End index: " + matcher.end());
    System.out.println("Found text: " + matcher.group());
}

Output:

Start index: 3
End index: 5
Found text: bc

2. References

  1. Pattern Class - Oracle Docs
  2. Pattern.matches Method - Oracle Dosc
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