perl和java正则表达式功能有什么区别？ [英] What are the differences between perl and java regex capabilities?

问题描述

关于支持哪些正则表达式术语，perl和java之间有什么区别？

What are the differences between perl and java with regard to what regular expression terms are supported?

此问题仅与正则表达式隔离，具体排除了差异在中如何使用正则表达式 - 即使用正则表达式的可用函数/方法 - 以及诸如java要求之间的语法差异以逃避反斜杠等。

This question is isolated to just the regular expressions, and specifically excludes differences in how regex can be used - ie the functions/methods available that use regex - and syntactic differences between the languages such as the java requirement to escape backslashes etc.

特别感兴趣的是java对可变长度后视的部分/偶尔支持。

Of particular interest is the partial/occasional support java has for variable length look-behinds.

推荐答案

比较 java的Perl 5部分.util.regex.Pattern 列出了许多不同之处。例如，Java不支持条件正则表达式。为此，您需要使用一些外部库，如 JRegex 。

The "Comparison to Perl 5" section of java.util.regex.Pattern lists many differences. For example, Java does not support conditional regex. For that, you need to use some external library like JRegex.

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