Java’s java.regex package does not support named groups, so this article will introduce third-party libraries to resolve this issue.
Java 7
Starting from Java 7, Java natively supports named groups. You can use the following structure:
Pre-Java 7 Alternatives
For versions prior to Java 7, the following third-party libraries provide named group support:
The following is an example of using named groups:
String:
"TEST 123"
Regular expression:
"(?<login>\w+) (?<id>\d+)"
Access:
matcher.group(1) == "TEST" matcher.group("login") == "TEST" matcher.name(1) == "login"
Replacement:
matcher.replaceAll("aaaaa__sssss_____") == "aaaaa_TEST_sssss_123____" matcher.replaceAll("aaaaa_${login}_sssss_${id}____") == "aaaaa_TEST_sssss_123____"
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