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regex match (#178)
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‎src/main/java/com/examplehub/basics/regex/MatchesExample.java

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package com.examplehub.basics.regex;
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public class MatchesExample {
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}

‎src/test/java/com/examplehub/basics/regex/MatchesExampleTest.java

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package com.examplehub.basics.regex;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.*;
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class MatchesExampleTest {
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@Test
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void testGivenDigits() {
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String regex = "1\\d{10}";
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assertTrue("12345678910".matches(regex));
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assertFalse("123456789101".matches(regex));
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assertTrue("19999999999".matches(regex));
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assertFalse("09999999999".matches(regex));
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assertFalse("199999d9999".matches(regex));
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assertTrue("abc".matches("abc"));
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assertFalse("ABC".matches("abc"));
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assertFalse("Abc".matches("abc"));
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}
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@Test
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void testRangedDigits() {
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String regex = "a\\d{3,8}";
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assertTrue("a123".matches(regex));
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assertTrue("a1234".matches(regex));
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assertTrue("a1235".matches(regex));
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assertTrue("a12345".matches(regex));
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assertTrue("a123456".matches(regex));
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assertTrue("a12345678".matches(regex));
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assertFalse("a12".matches(regex));
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assertFalse("a1".matches(regex));
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assertFalse("a".matches(regex));
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assertFalse("a123a5678".matches(regex));
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assertFalse("a123456789".matches(regex));
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regex = "a\\d{2,}";
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assertTrue("a12".matches(regex));
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assertTrue("a123".matches(regex));
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assertTrue("a1234".matches(regex));
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assertTrue("a12345".matches(regex));
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assertTrue("a123456".matches(regex));
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assertTrue("a12341241234123413521542345326346543745875685698".matches(regex));
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}
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@Test
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void testDot() {
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String regex = "a.c";
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assertTrue("abc".matches(regex));
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assertTrue("a-c".matches(regex));
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assertTrue("a|c".matches(regex));
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assertTrue("a.c".matches(regex));
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assertFalse("ac".matches(regex));
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assertFalse("abbc".matches(regex));
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}
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@Test
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void testDigit() {
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String regex = "00\\d";
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assertTrue("007".matches(regex));
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assertTrue("009".matches(regex));
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assertFalse("0000".matches(regex));
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assertFalse("0001".matches(regex));
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assertFalse("00a".matches(regex));
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assertFalse("00A".matches(regex));
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}
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@Test
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void testNonDigit() {
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String regex = "00\\D";
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assertFalse("007".matches(regex));
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assertFalse("009".matches(regex));
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assertTrue("00A".matches(regex));
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assertTrue("00 ".matches(regex));
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assertTrue("00a".matches(regex));
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assertTrue("00#".matches(regex));
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assertTrue("00$".matches(regex));
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assertTrue("00\r".matches(regex));
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assertTrue("00\n".matches(regex));
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}
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@Test
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void testAnyDigit() {
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String regex = "\\d*";
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assertTrue("".matches(regex));
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assertTrue("1".matches(regex));
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assertTrue("01".matches(regex));
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assertTrue("012".matches(regex));
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assertFalse("a".matches(regex));
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assertFalse("a0".matches(regex));
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assertFalse("a01".matches(regex));
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}
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@Test
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void testOneMoreDigits() {
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String regex = "\\d+";
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assertFalse("".matches(regex));
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assertTrue("1".matches(regex));
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assertTrue("01".matches(regex));
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assertTrue("012".matches(regex));
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assertFalse("a".matches(regex));
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assertFalse("a0".matches(regex));
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assertFalse("a01".matches(regex));
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}
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@Test
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void testOneOrZeroDigit() {
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String regex = "a\\d?";
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assertTrue("a1".matches(regex));
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assertTrue("a".matches(regex));
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assertFalse("a123".matches(regex));
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assertFalse("ab".matches(regex));
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}
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@Test
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void testWord() {
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String regex = "java\\w";
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assertTrue("javac".matches(regex));
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assertTrue("java8".matches(regex));
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assertTrue("java_".matches(regex));
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assertFalse("javac8".matches(regex));
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assertFalse("java".matches(regex));
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assertFalse("java ".matches(regex));
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assertFalse("java$".matches(regex));
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assertFalse("java#".matches(regex));
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}
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@Test
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void testNonWord() {
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String regex = "java\\W";
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assertFalse("javac".matches(regex));
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assertFalse("java8".matches(regex));
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assertFalse("java_".matches(regex));
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assertFalse("javac8".matches(regex));
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assertFalse("java".matches(regex));
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assertTrue("java ".matches(regex));
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assertTrue("java$".matches(regex));
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assertTrue("java#".matches(regex));
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}
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@Test
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void testSpace() {
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String regex = "a\\sc";
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assertTrue("a c".matches(regex));
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assertTrue("a c".matches(regex));
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assertFalse("abc".matches(regex));
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assertTrue("a\rc".matches(regex));
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assertTrue("a\nc".matches(regex));
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}
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@Test
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void testPhoneNumber() {
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String regex = "[1-9]\\d{6,7}";
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assertTrue("12345678".matches(regex));
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assertTrue("1234567".matches(regex));
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assertFalse("01234567".matches(regex));
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assertFalse("0123456".matches(regex));
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}
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@Test
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void testHex() {
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String regex = "[0-9a-fA-F]{4}";
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assertTrue("aF30".matches(regex));
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assertTrue("abcd".matches(regex));
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assertTrue("ABCD".matches(regex));
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assertTrue("1234".matches(regex));
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}
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@Test
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void testExclude() {
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String regex = "[^1-9]{3}";
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assertTrue("A00".matches(regex));
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assertTrue("ABC".matches(regex));
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assertFalse("A01".matches(regex));
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assertFalse("A05".matches(regex));
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}
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@Test
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void testOr() {
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String regex = "java|python";
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assertTrue("java".matches(regex));
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assertTrue("python".matches(regex));
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assertFalse("go".matches(regex));
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regex = "learn\\s([jJ]ava|[pP]ython)";
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assertTrue("learn java".matches(regex));
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assertTrue("learn python".matches(regex));
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assertFalse("learn go".matches(regex));
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assertTrue("learn Java".matches(regex));
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assertTrue("learn Python".matches(regex));
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}
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}

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