Add examples for substring operations (#5139)
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package com.baeldung.string;
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import java.util.Scanner;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Assert;
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import org.junit.Test;
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public class SubstringUnitTest {
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String text = "Julia Evans was born on 25-09-1984. She is currently living in the USA (United States of America).";
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@Test
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public void givenAString_whenUsedStringUtils_ShouldReturnProperSubstring() {
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Assert.assertEquals("United States of America", StringUtils.substringBetween(text, "(", ")"));
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Assert.assertEquals("the USA (United States of America).", StringUtils.substringAfter(text, "living in "));
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Assert.assertEquals("Julia Evans", StringUtils.substringBefore(text, " was born"));
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}
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@Test
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public void givenAString_whenUsedScanner_ShouldReturnProperSubstring() {
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try (Scanner scanner = new Scanner(text)) {
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scanner.useDelimiter("\\.");
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Assert.assertEquals("Julia Evans was born on 25-09-1984", scanner.next());
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}
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}
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@Test
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public void givenAString_whenUsedSplit_ShouldReturnProperSubstring() {
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String[] sentences = text.split("\\.");
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Assert.assertEquals("Julia Evans was born on 25-09-1984", sentences[0]);
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}
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@Test
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public void givenAString_whenUsedRegex_ShouldReturnProperSubstring() {
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Pattern pattern = Pattern.compile("\\d{2}\\-\\d{2}-\\d{4}");
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Matcher matcher = pattern.matcher(text);
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if (matcher.find()) {
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Assert.assertEquals("25-09-1984", matcher.group());
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}
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}
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@Test
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public void givenAString_whenUsedSubSequence_ShouldReturnProperSubstring() {
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Assert.assertEquals("USA (United States of America)", text.subSequence(67, text.length() - 1));
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}
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@Test
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public void givenAString_whenUsedSubstring_ShouldReturnProperSubstring() {
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Assert.assertEquals("USA (United States of America).", text.substring(67));
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Assert.assertEquals("USA (United States of America)", text.substring(67, text.length() - 1));
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}
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@Test
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public void givenAString_whenUsedSubstringWithIndexOf_ShouldReturnProperSubstring() {
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Assert.assertEquals("United States of America", text.substring(text.indexOf('(') + 1, text.indexOf(')')));
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}
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}
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