How Can I Extract All Regex Matches into an Array in Java?

Extract String Matches into Array Using Regex Expressions in Java

In Java, the inability to directly obtain an array of regex matches may leave you puzzled. This guide addresses this challenge, providing solutions to capture all strings that conform to a regular expression.

The key to retrieving these matches lies in utilizing a matcher, which iteratively locates occurrences:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

List<String> allMatches = new ArrayList<>();
Matcher m = Pattern.compile("your regex expression here")
    .matcher(yourStringHere);
while (m.find()) {
   allMatches.add(m.group());
}

After populating allMatches with the matches, you can convert it to an array if necessary:

allMatches.toArray(new String[0]);

Alternatively, you may consider using MatchResult to simplify matching operations. A helper function like allMatches:

public static Iterable<MatchResult> allMatches(
      final Pattern p, final CharSequence input) {
  ...
}

allows you to iterate over matches, such as:

for (MatchResult match : allMatches(Pattern.compile("[abc]"), "abracadabra")) {
  System.out.println(match.group() + " at " + match.start());
}

Providing the output:

a at 0
b at 1
a at 3
c at 4
a at 5
a at 7
b at 8
a at 10

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