Javascript正则表达式与Perl正则表达式相比 [英] Javascript regex compared to Perl regex

问题描述

当谈到正则表达式时，我只是一个菜鸟。我知道Perl在regexp上很棒，我不太了解Perl。最近开始学习JavaScript并且遇到了正则表达式，用于
验证用户输入...没有太多使用它们。

I'm just a noob when it comes to regexp. I know Perl is amazing with regexp and I don't know much Perl. Recently started learning JavaScript and came across regex for validating user inputs... haven't used them much.

JavaScript regexp与Perl regexp相比如何？相同点和不同点？

用JS编写的所有regexp都可以在Perl中使用，反之亦然吗？

类似的语法？

How does JavaScript regexp compare with Perl regexp? Similarities and differences?
Can all regexp(s) written in JS be used in Perl and vice-versa?
Similar syntax?

推荐答案

从ECMAScript 2018开始，许多JavaScript的正则表达式缺陷已得到修复。

From ECMAScript 2018 onwards, many of JavaScript's regex deficiencies have been fixed.

• 它现在支持 lookbehind断言，甚至是无限断言。


• Unicode属性转义已经添加了。


• 最后有一个 DOTALL （ / s ）标志。

• It now supports lookbehind assertions, even unbounded ones.
• Unicode property escapes have been added.
• There finally is a DOTALL (/s) flag.

仍然缺少什么：

• JavaScript没有办法通过最终匹配来防止回溯（使用所有格量词 ++ / * + / ？+ 或原子组（？> ; ...））。


• 不支持递归/平衡子组匹配。


• 另一个（化妆品）事情是JavaScript不知道冗长的正则表达式，这可能使它们更难阅读。

• JavaScript doesn't have a way to prevent backtracking by making matches final (using possessive quantifiers ++/*+/?+ or atomic groups (?>...)).
• Recursive/balanced subgroup matching is not supported.
• One other (cosmetic) thing is that JavaScript doesn't know verbose regexes, which might make them harder to read.

除此之外，基本的正则表达式语法两种口味非常相似。

Other than that, the basic regex syntax is very similar in both flavors.

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