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Compare the differences between regular expressions in JavaScript and Java

巴扎黑
巴扎黑Original
2017-08-18 09:57:161535browse

This article mainly introduces the difference between JavaScript and Java regular expression writing. Friends in need can refer to

Js verification writing method: (escape character\)


var str = "待验证文本";
var regular = new RegExp(/这里是正则表达式/);
if (regular.test(str)) {
  console.log("符合条件");
} else {
  console.log("不符合条件");
}
//或者
var str = "待验证文本";
if (/这里是正则表达式/.test(str)) {
  console.log("符合条件");
} else {
  console.log("不符合条件");
}

Java verification writing method: (escape character \\)


String str = "待验证文本";
String regular = "这里是正则表达式";
if (Pattern.compile(regular).matcher(str).matches()) {
  System.out.println("符合条件");
} else {
  System.out.println("不符合条件");
}
//或者
String str = "待验证文本";
if (str.matches("这里是正则表达式")) {
  System.out.println("符合条件");
} else {
  System.out.println("不符合条件");
}

Some commonly used regular expressions


验证只能含有6-16位大小写字母、数字、下划线:
^[\w]{6,16}$
验证字符串是否全是空格组成:
^[\s]+$
验证只能含有中文、大小写字母、数字、下划线(不含中文符号):
^[\u4E00-\u9FA5\w]+$
验证邮箱格式:
^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]+$
验证只能含有大小写字母和数字
^[a-zA-Z0-9]+$

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