JavaScript正则regexp 的相关内容

文章 2023-04-15 来自：开发者社区

js：使用正则RegExp实现字符串全部替换replaceAll

文档https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions正则表达式中包含的标志标志描述g全局搜索。i不区分大小写搜索。m多行搜索。s允许 . 匹配换行符。u使用 unicode 码的模式进行匹配。y执行“粘性 (sticky)”搜索，匹配从目标字符串的当前位置开始。语法：var re =....

文章 2022-09-12 来自：开发者社区

JS：正则RegExp对象匹配中文汉字

以下方式相同// 需要常规的字符转义规则 var re1 = new RegExp("^\\d+万$"); console.log(re1.test('30万')); var re2 = /^\d+万$/; console.log(re2.test('20万')); 参考https://www.runoob.com/jsref/jsref-obj-regexp.html

文章 2021-11-26 来自：开发者社区

JS：正则RegExp对象匹配中文汉字

以下方式相同// 需要常规的字符转义规则 var re1 = new RegExp("^\\d+万$"); console.log(re1.test('30万')); var re2 = /^\d+万$/; console.log(re2.test('20万'));参考https://www.runoob.com/jsref/jsref-obj-regexp.html

文章 2014-06-06 来自：开发者社区

浅谈 js 正则字面量与 new RegExp 执行效率

原文:浅谈 js 正则字面量与 new RegExp 执行效率前几天谈了正则匹配 js 字符串的问题：《js 正则学习小记之匹配字符串》和《js 正则学习小记之匹配字符串优化篇》。里面讲到了优化正则起到提升性能的问题，但是能提升多少呢？于是我去测试了，发现TMD几乎微乎其微，我用1千字符串进行100万次匹配测试，优不优化根本没区别。这不科学，我白看了这么多天正则，上天这是在玩弄我么。 ....

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