JavaScript编程正则表达式的相关内容

文章 2017-12-15 来自：开发者社区

JS编程建议——38：正确认识正则表达式工作机制

建议38：正确认识正则表达式工作机制有很多因素影响正则表达式的效率。首先，正则表达式适配的文本千差万别，部分匹配时比完全不匹配所用的时间要长。其次，每种浏览器的正则表达式引擎也有不同的内部优化。要有效使用正则表达式，重要的是理解它们的工作机制。一个正则表达式处理的基本步骤如下：第1步，编译。在创建了一个正则表达式对象后，浏览器先要检查模板有没有错误，然后将它转换成一个本机代码例程，用于执行匹配工....

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更新时间 2024-03-04 12:28:20

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