正则表达式【Java】【JS】

1.是否包含字符

Java
Pattern.matches(正则表达式, 字符串)

import java.util.regex.*;
 
class RegexExample1{
   public static void main(String args[]){
      String content = "I am noob from runoob.com.";
      String pattern = ".*runoob.*";
      boolean isMatch = Pattern.matches(pattern, content);
      System.out.println("字符串中是否包含了 'runoob' 子字符串? " + isMatch);
   }
}
// 输出结果：字符串中是否包含了 'runoob' 子字符串? true

JS
正则表达式.test(字符串)

/e/.test("The best things in life are free!");
// 输出结果：true

---

2.替换
Java
Pattern.compile(正则表达式).matcher(原字符串).replaceAll(替换字符串)

import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class RegexMatches
{
    private static String REGEX = "dog";
    private static String INPUT = "The dog says meow. All dogs say meow.";
    private static String REPLACE = "cat";
 
    public static void main(String[] args) {
       Pattern p = Pattern.compile(REGEX);
       Matcher m = p.matcher(INPUT); 
       INPUT = m.replaceAll(REPLACE);
       System.out.println(INPUT);
   }
}
// 输出结果：The cat says meow. All cats say meow.

JS
原字符串.replace(正则表达式，替换字符串)

"wzm".replace(/wzm/i,"wangzemin");
// 输出结果：wangzemin