string.search
search() 方法执行正则表达式和 String对象之间的一个搜索匹配。
语法
str.search(regexp)参数
regexp一个正则表达式（regular expression）对象。如果传入一个非正则表达式对象，则会使用 new RegExp(obj) 隐式地将其转换为正则表达式对象。
返回值
如果匹配成功，则 search() 返回正则表达式在字符串中首次匹配项的索引。否则，返回 -1。
描述
示例
例子：使用 search
下例记录了一个消息字符串，该字符串的内容取决于匹配是否成功。
var str = "hey JudE";
var re = /[A-Z]/g;
var re2 = /[.]/g;
console.log(str.search(re)); // returns 4, which is the index of the first capital letter "J"
console.log(str.search(re2)); // returns -1 cannot find '.' dot punctuation规范
Specification | Status | Comment |
|---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.2. |
ECMAScript 5.1 (ECMA-262)The definition of 'String.prototype.search' in that specification. | Standard | |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'String.prototype.search' in that specification. | Standard | |
ECMAScript Latest Draft (ECMA-262)The definition of 'String.prototype.search' in that specification. | Living Standard | |
浏览器兼容性
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
flags | No | No | (Yes) — 49 | No | No | No |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
flags | No | No | No | No | No | No | No |
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