使用正则表达式为所选字符添加反斜杠

Question

我目前使用的代码很难看,因为我必须为每个特殊字符单独写"替换".

var str = ":''>";
str.replace("'","\\'").replace(">","\\>");

我想将反斜杠添加到<>*()和？通过正则表达式.

Answer 1

使用与字符集匹配的正则表达式,您可以尝试:

str = str.replace(/([<>*()?])/g, "\\$1");

演示: http ://jsfiddle.net/8ar3Z/

It matches any of the characters inside of the [ ] (the ones you specified), captures them with the surrounding () (so that it can be referenced as $1 in the replaced text part), and then prepends with \\.

UPDATE:

As a suggestion from Mr. @T.J.Crowder, it is unnecessary to capture with (), changing $1 to $&, written as:

str = str.replace(/[<>*()?]/g, "\\$&");

DEMO: http://jsfiddle.net/8ar3Z/1/

References:

• Regex character set: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#special-character-set
• $1 and $& use: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#Specifying_a_string_as_a_parameter