我想知道正则表达式是否适用于PHP、Javascript等所有语言。?
How to get a selected text inside a iframe. I my page i m having a iframe which is editable true. So how can i get the selected text in that iframe.
我想知道正则表达式是否适用于PHP、Javascript等所有语言。?
你的问题对我来说有点模棱两可:你必须定义Universal的含义,但我的答案是:
正则表达式几乎用于所有编程语言,如PHP、JavaScript、Perl、Awk、Java、C#等。。。
问题是不同语言的语法可能会有一点不同,每种语言都可能以不同的方式实现它们,并包括或不包括一些特定的功能(通常是允许regex不仅识别常规语言,还识别其他语言,如上下文无关ones)
如果您创建了一种新的编程语言,您可以添加正则表达式功能,但这并不意味着语法将与.NET中的正则表达式语法完全相同。不仅如此:引擎的实现肯定会与其他引擎不同(效率更高/更低)。。。
它们并不完全一样
不。正则表达式有很多方言,尽管基本表达式往往很相似。此外,在一种方言中引入的有用特征经常被其他方言复制。
正则表达式本身就是一种编程构造。因此,您会发现,关于模式匹配表达式的核心概念基本上是通用的,然而,每个实现都会提供其特定的语法旋转来实现这一点。
不。但是你可能使用的任何都会以某种形式支持它们。
坏消息是不!
正则表达式有许多实现和变体。
在标准的unix实现中,ksh、bash、grep和awk都使用稍微不同的规则。lua有一个非常有限的regex库,Java有一个功能齐全的lib,但有自己的怪癖。
好消息是,大多数流行的脚本语言(php、python等)都使用“pcre”库,而且“pcre“根据定义代表“Perl Compatable Regular Expresions”,它的工作原理尽可能与Perl正则表达式相同。pcre库可从链接到已编译语言(C、C++等)。
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