是否必须在正则表达式的字符类(方括号)中对点进行转义? [英] Does a dot have to be escaped in a character class (square brackets) of a regular expression?

问题描述

正则表达式中的点.与任何单个字符匹配.为了使正则表达式匹配点，必须对点进行转义:\.

A dot . in a regular expression matches any single character. In order for regex to match a dot, the dot has to be escaped: \.

已向我指出在方括号[]内的点不必转义.例如，表达式: [.]{3}将匹配...字符串.

It has been pointed out to me that inside square brackets [] a dot does not have to be escaped. For example, the expression: [.]{3} would match ... string.

不是吗，真的吗?如果是这样，那么所有正则表达式标准都适用吗?

Doesn't it, really? And if so, is it true for all regex standards?

推荐答案

在字符类(方括号)中，除^，-，]或\以外的任何字符都是文字.

In a character class (square brackets) any character except ^, -, ] or \ is a literal.

此网站是出色的参考书，并且提供了许多有关不同正则表达式风味的细微差别的信息. http://www.regular-expressions.info/refcharclass.html

This website is a brilliant reference and has lots of info on the nuances of different regex flavours. http://www.regular-expressions.info/refcharclass.html

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