regex
Back references example
In this example we shall show you how to use Matcher.replaceAll(String replacement)
API method to replace every subsequence of an input sequence that matches a specified pattern with a given replacement string. To replace any subsequence of a given sequence with a given String one should perform the following steps:
- Compile a String regular expression to a Pattern, using
compile(String regex)
API method of Pattern. - Use
matcher(CharSequence input)
API method of Pattern to create a Matcher that will match the given String input against this pattern. - Use
replaceAll(String replacement)
API method, with a given String parameter to replace all subsequences of the sequence that matches the pattern with the given String,
as described in the code snippet below.
package com.javacodegeeks.snippets.basics; import java.util.regex.Matcher; import java.util.regex.Pattern; public class BackRferences { public static void main(String args[]) { String reg_exxp = "(\\w)(\\d)(\\w+)"; Pattern p = Pattern.compile(reg_exxp); String cand = "X99 "; Matcher m = p.matcher(cand); String temp = m.replaceAll("$33"); System.out.println("REPLACEMENT: " + temp); System.out.println("ORIGINAL: " + cand); } }
Output:
REPLACEMENT: 93
ORIGINAL: X99
This was an example of Matcher.replaceAll(String replacement)
API method in Java.