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[indexes-of-matches] Get the Indexes of Regex Pattern Matches in Java (#14648)

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Kai Yuan 2023-08-26 16:23:29 +02:00 committed by GitHub
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core-java-modules/core-java-regex-2/src/test/java/com/baeldung/regex/indexesofmatches/IndexesOfMatchesUnitTest.java Normal file
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package com.baeldung.regex.indexesofmatches;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.junit.jupiter.api.Test;
public class IndexesOfMatchesUnitTest {
private static final String INPUT = "This line contains <the first value>, <the second value>, and <the third value>.";
@Test
void whenUsingNorCharClass_thenGetExpectedTexts() {
Pattern pattern = Pattern.compile("<[^>]*>");
Matcher matcher = pattern.matcher(INPUT);
List<String> result = new ArrayList<>();
while (matcher.find()) {
result.add(matcher.group());
}
assertThat(result).containsExactly("<the first value>", "<the second value>", "<the third value>");
}
@Test
void whenCallingMatcherEnd_thenGetIndexesAfterTheMatchSequence() {
Pattern pattern = Pattern.compile("456");
Matcher matcher = pattern.matcher("0123456789");
String result = null;
int startIdx = -1;
int endIdx = -1;
if (matcher.find()) {
result = matcher.group();
startIdx = matcher.start();
endIdx = matcher.end();
}
assertThat(result).isEqualTo("456");
assertThat(startIdx).isEqualTo(4);
assertThat(endIdx).isEqualTo(7);
}
@Test
void whenUsingMatcherStartAndEnd_thenGetIndexesOfMatches() {
Pattern pattern = Pattern.compile("<[^>]*>");
Matcher matcher = pattern.matcher(INPUT);
List<String> result = new ArrayList<>();
Map<Integer, Integer> indexesOfMatches = new LinkedHashMap<>();
while (matcher.find()) {
result.add(matcher.group());
indexesOfMatches.put(matcher.start(), matcher.end());
}
assertThat(result).containsExactly("<the first value>", "<the second value>", "<the third value>");
assertThat(indexesOfMatches.entrySet()).map(entry -> INPUT.substring(entry.getKey(), entry.getValue()))
.containsExactly("<the first value>", "<the second value>", "<the third value>");
}
@Test
void whenUsingMatcherStartAndEndWithGroupIdx_thenGetIndexesOfMatches() {
Pattern pattern = Pattern.compile("<([^>]*)>");
Matcher matcher = pattern.matcher(INPUT);
List<String> result = new ArrayList<>();
Map<Integer, Integer> indexesOfMatches = new LinkedHashMap<>();
while (matcher.find()) {
result.add(matcher.group(1));
indexesOfMatches.put(matcher.start(1), matcher.end(1));
}
assertThat(result).containsExactly("the first value", "the second value", "the third value");
assertThat(indexesOfMatches.entrySet()).map(entry -> INPUT.substring(entry.getKey(), entry.getValue()))
.containsExactly("the first value", "the second value", "the third value");
}
}