JavaScript正则学习的相关内容

文章 2014-06-06 来自：开发者社区

js 正则学习小记之匹配字符串

原文:js 正则学习小记之匹配字符串今天看了第5章几个例子，有点收获，记录下来当作回顾也当作分享。关于匹配字符串问题，有很多种类型，今天讨论 js 代码里的字符串匹配。(因为我想学完之后写个语法高亮练手，所以用js代码当作例子) var str1 = "我是字符串1哦，快把我取走", str2 = "我是字符串2哦，快把我取走"; 比如这样一个字符串，匹配起来很简单 /"[...

文章 2014-06-06 来自：开发者社区

原文:js 正则学习小记之左最长规则昨天我在判断正则引擎用到的方法是用 /nfa|nfa not/ 去匹配 "nfa not"，得到的结果是 'nfa'。其实我们的本意是想得到整个字符串 "nfa not" 的，可却只得到了 'nfa'。再来看个例子，/an (nfa)?(nfa test)?/ 去匹配 "an nfa test"，如果和上面一样的解释，那应该只得到 'an nfa'，接着第....

文章 2014-06-06 来自：开发者社区

js 正则学习小记之匹配字符串优化篇

原文:js 正则学习小记之匹配字符串优化篇昨天在《js 正则学习小记之匹配字符串》谈到 /"(?:\\.|[^"])*"/ 是个不错的表达式，因为可以满足我们的要求，所以这个表达式可用，但不一定是最好的。从性能上来说，他非常糟糕，为什么这么说呢，因为传统型NFA引擎遇到分支是从左往右匹配的，所以它会用 \\. 去匹配每一个字符，发现不对后才用 [^"] 去匹配。比如这样一个字符串: "12....

文章 2014-05-10 来自：开发者社区

js 正则学习小记之NFA引擎

原文:js 正则学习小记之NFA引擎之前一直认为自己正则还不错，在看次碳酸钴，Barret Lee 等大神都把正则玩的出神入化后发现我只是个战五渣。求抱大腿，求大神调教、之前大致有个印象，正则有很多种引擎，但我根本不知道有哪些引擎。今天在读《精通正则表达式》才发现有Traditional NFA，POSIX NFA 和 DFA (具体自己百度下吧）。可用了这么久...

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