{% code %} package _11zhengze;
import java.util.regex.Matcher; import java.util.regex.Pattern;
public class Main {
static boolean isValidMobileNumber(String s) {
return s.matches("\\d{11}");
}
public static void main(String[] args) {
//判断是否是电话号码
System.out.println(isValidMobileNumber("18640274769"));
//判断是否是20##年
String regex = "20\\d\\d";
System.out.println("2019".matches(regex)); // true
System.out.println("2100".matches(regex)); // false
//精确匹配 match
String re1 = "abc";
System.out.println("abc".matches(re1));
System.out.println("Abc".matches(re1));
System.out.println("abcd".matches(re1));
String re2 = "a\\&c"; // 对应的正则是a\&c
System.out.println("a&c".matches(re2));
System.out.println("a-c".matches(re2));
System.out.println("a&&c".matches(re2));
//匹配任意字符
String re3 = "a.c";
System.out.println("abc".matches(re3));
System.out.println("aBc".matches(re3));
//匹配数字
String re4 = "00\\d";
System.out.println("007".matches(re4));
System.out.println("00A".matches(re4));
//匹配常用字符 不能匹配#和空格
String re5 = "java\\w";
System.out.println("javac".matches(re5));
System.out.println("java9".matches(re5));
System.out.println("java_".matches(re5));
System.out.println("java#".matches(re5));
System.out.println("java ".matches(re5));
//匹配空格字符 包括空格和tab
String re6 = "a\\sc";
System.out.println("a c".matches(re6));
System.out.println("a\tc".matches(re6));
//匹配非数字 类似 \W \S
String re7 = "java\\d"; // 对应的正则是java\d
System.out.println("java9".matches(re7));
System.out.println("java10".matches(re7));
System.out.println("javac".matches(re7));
String re8 = "java\\D";
System.out.println("javax".matches(re8));
System.out.println("java#".matches(re8));
System.out.println("java5".matches(re8));
//重复匹配
String re9 = "A\\d*"; //匹配任意字符，包括0个
System.out.println("A".matches(re9));
System.out.println("A380".matches(re9));
String re10 = "A\\d+"; //匹配至少一个字符
System.out.println("A".matches(re10));
System.out.println("A380".matches(re10));
String re11 = "A\\d?"; //匹配0个或一个
System.out.println("A".matches(re11));
System.out.println("A3".matches(re11));
System.out.println("A380".matches(re11));
//匹配指定个数字符
String re12 = "A\\d{3}"; //3个
System.out.println("A380".matches(re12));
String re13 = "A\\d{3,5}"; //3到5个
System.out.println("A380".matches(re13));
System.out.println("A3801".matches(re13));
String re14 = "A\\d{3,}"; //至少三个
System.out.println("A38023421".matches(re14));
/**复杂匹配规则*/
//^匹配开头和$结尾
String re15 = "^A\\d{3}$"; //至少三个
System.out.println("A380".matches(re15));
//匹配指定范围
String re16 = "[123456789]\\d{6,7}";
String re17 = "[1...9]\\d{6,7}";
System.out.println("1864027".matches(re16));
System.out.println("1864027".matches(re17));
String re18 = "[0-9a-fA-F]{6}"; //匹配0-9,a-f,A-F
System.out.println("1A2b3c".matches(re18));
String re19 = "[^1-9]{3}"; //排除法，不包含1-9
System.out.println("ABC".matches(re19));
System.out.println("AB1".matches(re19));
//或规则匹配
String re20 = "java|php";
System.out.println("java".matches(re20));
System.out.println("php".matches(re20));
System.out.println("go".matches(re20));
//使用括号 重复部分
String re21 = "learn\\s(java|php|go)";
System.out.println("learn java".matches(re21));
System.out.println("learn Java".matches(re21));
System.out.println("learn php".matches(re21));
System.out.println("learn Go".matches(re21));
//分组匹配
Pattern pattern = Pattern.compile("(\\d{3,4})\\-(\\d{7,8})");
pattern.matcher("010-12345678").matches(); // true
pattern.matcher("021-123456").matches(); // true
pattern.matcher("022#1234567").matches(); // false
// 获得Matcher对象:
Matcher matcher = pattern.matcher("010-12345678");
if (matcher.matches()) {
String whole = matcher.group(0); // "010-12345678", 0表示匹配的整个字符串
String area = matcher.group(1); // "010", 1表示匹配的第1个子串
String tel = matcher.group(2); // "12345678", 2表示匹配的第2个子串
System.out.println(whole);
System.out.println(area);
System.out.println(tel);
}
//非贪婪匹配 尽可能少的匹配
Pattern pattern1 = Pattern.compile("(\\d+?)(0*)");
Matcher matcher1 = pattern1.matcher("1230000");
if (matcher1.matches()) {
System.out.println("group1=" + matcher1.group(1)); // "123"
System.out.println("group2=" + matcher1.group(2)); // "0000"
}
//分割字符串
String[] s = "a, b ;; c".split("[\\,\\;\\s]+");
System.out.println(s[0]+s[1]+s[2]);
//搜索字符串
String s1 = "the quick brown fox jumps over the lazy dog.";
Pattern p = Pattern.compile("\\wo\\w");
Matcher m = p.matcher(s1);
while (m.find()) {
String sub = s1.substring(m.start(), m.end());
System.out.println(sub);
}
//替换字符串
String s2 = "The quick\t\t brown fox jumps over the lazy dog.";
String r = s2.replaceAll("\\s+", " ");
System.out.println(r); // "The quick brown fox jumps over the lazy dog."
//反向引用
String s3 = "the quick brown fox jumps over the lazy dog.";
String r3 = s3.replaceAll("\\s([a-z]{4})\\s", " <b>$1</b> ");
System.out.println(r3);
}
} {% endcode %}
<p>单个字符的匹配规则如下：</p><table><thead><tr><th>正则表达式</th> <th>规则</th> <th>可以匹配</th> </tr></thead><tbody><tr><td><code>A</code></td> <td>指定字符</td> <td><code>A</code></td> </tr><tr><td><code>\u548c</code></td> <td>指定Unicode字符</td> <td><code>和</code></td> </tr><tr><td><code>.</code></td> <td>任意字符</td> <td><code>a</code>，<code>b</code>，<code>&</code>，<code>0</code></td> </tr><tr><td><code>\d</code></td> <td>数字0~9</td> <td><code>0</code>~<code>9</code></td> </tr><tr><td><code>\w</code></td> <td>大小写字母，数字和下划线</td> <td><code>a</code>~<code>z</code>，<code>A</code>~<code>Z</code>，<code>0</code>~<code>9</code>，<code>_</code></td> </tr><tr><td><code>\s</code></td> <td>空格、Tab键</td> <td>空格，Tab</td> </tr><tr><td><code>\D</code></td> <td>非数字</td> <td><code>a</code>，<code>A</code>，<code>&</code>，<code>_</code>，……</td> </tr><tr><td><code>\W</code></td> <td>非\w</td> <td><code>&</code>，<code>@</code>，<code>中</code>，……</td> </tr><tr><td><code>\S</code></td> <td>非\s</td> <td><code>a</code>，<code>A</code>，<code>&</code>，<code>_</code>，……</td> </tr></tbody></table><p>多个字符的匹配规则如下：</p>
<table><thead><tr><th>正则表达式</th> <th>规则</th> <th>可以匹配</th> </tr></thead><tbody><tr><td><code>A*</code></td> <td>任意个数字符</td> <td>空，<code>A</code>，<code>AA</code>，<code>AAA</code>，……</td> </tr><tr><td><code>A+</code></td> <td>至少1个字符</td> <td><code>A</code>，<code>AA</code>，<code>AAA</code>，……</td> </tr><tr><td><code>A?</code></td> <td>0个或1个字符</td> <td>空，<code>A</code></td> </tr><tr><td><code>A{3}</code></td> <td>指定个数字符</td> <td><code>AAA</code></td> </tr><tr><td><code>A{2,3}</code></td> <td>指定范围个数字符</td> <td><code>AA</code>，<code>AAA</code></td> </tr><tr><td><code>A{2,}</code></td> <td>至少n个字符</td> <td><code>AA</code>，<code>AAA</code>，<code>AAAA</code>，……</td> </tr><tr><td><code>A{0,3}</code></td> <td>最多n个字符</td> <td>空，<code>A</code>，<code>AA</code>，<code>AAA</code></td> </tr></tbody></table><p>复杂匹配规则主要有：</p>
<table><thead><tr><th>正则表达式</th> <th>规则</th> <th>可以匹配</th> </tr></thead><tbody><tr><td>^</td> <td>开头</td> <td>字符串开头</td> </tr><tr><td>$</td> <td>结尾</td> <td>字符串结束</td> </tr><tr><td>[ABC]</td> <td>[…]内任意字符</td> <td>A，B，C</td> </tr><tr><td>[A-F0-9xy]</td> <td>指定范围的字符</td> <td><code>A</code>，……，<code>F</code>，<code>0</code>，……，<code>9</code>，<code>x</code>，<code>y</code></td> </tr><tr><td>[^A-F]</td> <td>指定范围外的任意字符</td> <td>非<code>A</code>~<code>F</code></td> </tr><tr><td>AB|CD|EF</td> <td>AB或CD或EF</td> <td><code>AB</code>，<code>CD</code>，<code>EF</code></td> </tr></tbody></table><p> </p>