廖雪峰Java9正则表达式-1正则表达式入门-2正则表达式匹配规则

正则表达式的匹配规则：

• 从左到右按规则匹配

匹配规则及示例	可以匹配	不能匹配
"abc"	"abc"	不能匹配："ab", "Abc", "abcd"
特殊字符需要转义，如"a&c"，注意Java的字符串需要再加一个转义符	"a&c"	"ab", "abc", "a&cd"
非ascii字符用"\u####"表示一个unicode字符，如"a\u548cc"	"a和c"	"a与c","a&c","abc"
. 可以匹配任意一个字符："a.c"	"abc", "a&c"	"ac", "abbc"
\d 可以匹配一个数字："00\d"	"007", "008"	"00A", "0077"
\D可以匹配一个非数字："00\D"	"00A", "00#"	"001"
\w可以匹配一个字母、数字或下划线："java\w"	"javac", "java8", "java_",	"java#", "java "
\s可以匹配一个空白字符："A\sB"	"A B" "A B"，tab键也算空白字符	"AB" "A B"
\W可以匹配一个非字母、数字或下划线："java\W"	"java!", "java "	"javac", "java8", "java_"
\S可以匹配一个非空白字符："A\SB"	"A&B", "ABB"	"A B","A B"tab键也算空白字符
修饰符可以匹配前的任意个字符："A\d*"，先匹配字母A，再匹配任意多个数字	"A", "A1", "A007"	"AB"
修饰符+可以匹配+前的至少一个字符："A\d+"，先匹配字母A，再匹配至少1个数字	"A1","A007"	"A", "AB"
修饰符?可以匹配0个或1个字符："A\d?"，先匹配字母A，再匹配0个或1个数字	"A","A1"	"A12","AB"
修饰符{n}可以匹配n个字符："\d{6}"	"123456", "999999"	"12345","1234567", "12345A"
修饰符{m,n}，可以匹配m-n个字符"\d{3,5}"	"123", "12345"	"12","12345", "123A5"
修饰符{n,}可以匹配至少n个字符:"\d{3,}"	"123", "1234", "123456789"	"12","123A"
^和\(匹配开头和结尾："^A\d{3}\)"	"A001", "A999"	"B001", "A0001"
[...]可以匹配范围内的字符: "[abc]1"	"a1", "b1", "c1"	"ab1", "x1"
"[a-f]1"	"a1", "b1", "f1"	"g1", "ab1"
"[a-f0-9]{6}"	"1a2b3c", "ffffff", "ff0102"	"abc12", "A0000F"
[^...] 在中括号内表示非，"[0-9]{6} 6位非数字字符串	"abcdef", "$$$$$$", "A-B-C-"	"1a2b3c", "A0000F"
AB|CD可以匹配AB或CD；如"java|php"	"java", "php"	"C++", "jphp"
"learn\s(java|php)"	"learn java", "learn php"	"learn C++", "learn python"
"learn\sjava|php"	"learn java", "php"	"learn java", "learn php"

package com.testRegex;

public class Telephone {
	public static Boolean invaildTel(String s) {
		return s.matches("\\d{3,4}\\-\\d{6,8}");
	}
}

package com.testRegex;

import static org.junit.Assert.*;

import org.junit.Test;

public class TelephoneTest {

	@Test
	public void testInvaildTel() {
		assertTrue(Telephone.invaildTel("010-123456"));
		assertTrue(Telephone.invaildTel("010-12345678"));
		assertTrue(Telephone.invaildTel("0123-123456"));
		assertTrue(Telephone.invaildTel("0123-12345678"));
		assertTrue(Telephone.invaildTel("123-123456"));
		assertTrue(Telephone.invaildTel("123-12345678"));

		assertFalse(Telephone.invaildTel("010#123456"));
		assertFalse(Telephone.invaildTel("010X12345678"));
		assertFalse(Telephone.invaildTel("01-12345678"));
		assertFalse(Telephone.invaildTel("01234-12345678"));
		assertFalse(Telephone.invaildTel("01A-12345678"));
		assertFalse(Telephone.invaildTel("0123-12345"));
		assertFalse(Telephone.invaildTel("0123-12345X"));
		assertFalse(Telephone.invaildTel("0123-123456789"));
		assertFalse(Telephone.invaildTel("0123-12345678X"));
	}
}

匹配QQ号，非0开头的5到11位数字字符串

package com.testList;

public class QQ {
    public static Boolean isVaildQQ(String s){
        return s.matches("^[1-9]\\d{4,10}$");
    }
}

package com.testList;

import org.junit.Test;

import static org.junit.Assert.*;

public class QQTest {

    @Test
    public void isVaildQQ() {
        assertTrue(QQ.isVaildQQ("10000"));
        assertTrue(QQ.isVaildQQ("99999"));
        assertTrue(QQ.isVaildQQ("1234567890"));
        assertTrue(QQ.isVaildQQ("9999999999"));

        assertFalse(QQ.isVaildQQ("00001"));
        assertFalse(QQ.isVaildQQ("099999"));
    }
}

电话号码优化，区号必须以0开头，电话号码不能以0开头

package com.testList;

public class Phone{
   public static boolean isVaildPhone(String s){
       return s.matches("^0\\d{2,3}(\\-|\\s)[1-9]\\d{6,7}$");
   }
}

package com.testList;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

public class PhoneTest {
   @Test
    public void testIsVaildPhone(){
       assertTrue(Phone.isVaildPhone("012-12345678"));
       assertTrue(Phone.isVaildPhone("012 12345678"));
       assertTrue(Phone.isVaildPhone("0123 1234567"));
       assertTrue(Phone.isVaildPhone("0123-1234567"));
       assertTrue(Phone.isVaildPhone("012 12345678"));

       assertFalse(Phone.isVaildPhone("123-12345678"));
       assertFalse(Phone.isVaildPhone("123-0123456"));
       assertFalse(Phone.isVaildPhone("023-0123456"));
       assertFalse(Phone.isVaildPhone("023-01234567"));
   }
}