diff --git a/core-java-modules/core-java-regex-2/src/test/java/com/baeldung/regex/aftermatch/GetTextAfterTheRegexMatchUnitTest.java b/core-java-modules/core-java-regex-2/src/test/java/com/baeldung/regex/aftermatch/GetTextAfterTheRegexMatchUnitTest.java new file mode 100644 index 0000000000..04650a0c02 --- /dev/null +++ b/core-java-modules/core-java-regex-2/src/test/java/com/baeldung/regex/aftermatch/GetTextAfterTheRegexMatchUnitTest.java @@ -0,0 +1,83 @@ +package com.baeldung.regex.aftermatch; + +import org.junit.jupiter.api.Test; + +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertTrue; + +public class GetTextAfterTheRegexMatchUnitTest { + private static final String INPUT1 = "Some text, targetValue=Regex is cool"; + private static final String INPUT2 = "Some text. targetValue=Java is cool. some other text"; + + @Test + void whenUsingSplit_thenGetExpectedString() { + String result1 = INPUT1.split("targetValue=")[1]; + assertEquals("Regex is cool", result1); + + String afterFirstSplit = INPUT2.split("targetValue=")[1]; + assertEquals("Java is cool. some other text", afterFirstSplit); + String result2 = afterFirstSplit.split("[.]")[0]; + assertEquals("Java is cool", result2); + + // if use the dot as the regex for splitting, the result array is empty + String[] splitByDot = INPUT2.split("targetValue=")[1].split("."); + assertEquals(0, splitByDot.length); + } + + @Test + void whenUsingReplaceAll_thenGetExpectedString() { + String result1 = INPUT1.replaceAll(".*targetValue=", ""); + assertEquals("Regex is cool", result1); + + String afterFirstReplace = INPUT2.replaceAll(".*targetValue=", ""); + assertEquals("Java is cool. some other text", afterFirstReplace); + String result2 = afterFirstReplace.replaceAll("[.].*", ""); + assertEquals("Java is cool", result2); + + } + + @Test + void whenUsingRegexGrouping_thenGetExpectedString() { + Pattern p1 = Pattern.compile("targetValue=(.*)"); + Matcher m1 = p1.matcher(INPUT1); + assertTrue(m1.find()); + String result1 = m1.group(1); + assertEquals("Regex is cool", result1); + + Pattern p2 = Pattern.compile("targetValue=([^.]*)"); + Matcher m2 = p2.matcher(INPUT2); + assertTrue(m2.find()); + String result2 = m2.group(1); + assertEquals("Java is cool", result2); + + Pattern p3 = Pattern.compile("targetValue=(.*?)[.]"); + Matcher m3 = p3.matcher(INPUT2); + assertTrue(m3.find()); + String result3 = m3.group(1); + assertEquals("Java is cool", result3); + } + + @Test + void whenUsingLookaround_thenGetExpectedString() { + Pattern p1 = Pattern.compile("(?<=targetValue=).*"); + Matcher m1 = p1.matcher(INPUT1); + assertTrue(m1.find()); + String result1 = m1.group(); + assertEquals("Regex is cool", result1); + + Pattern p2 = Pattern.compile("(?<=targetValue=)[^.]*"); + Matcher m2 = p2.matcher(INPUT2); + assertTrue(m2.find()); + String result2 = m2.group(); + assertEquals("Java is cool", result2); + + Pattern p3 = Pattern.compile("(?<=targetValue=).*(?=[.])"); + Matcher m3 = p3.matcher(INPUT2); + assertTrue(m3.find()); + String result3 = m3.group(); + assertEquals("Java is cool", result3); + } +} \ No newline at end of file