正则表达式与特殊字符匹配

Question

I have a string.match condition that was working until I realized that some words are " personal(computer) " have special characters like parentheses in the word. For example my code is grabbing the term to compare to which would be "personal(computer)" and searching through data to find any instance of that, but by using

string1.match(stringtarget,"ig"); //returns null 

I am a novice with regex, so how could I fix this to work for special characters as well.

Answer 1

If you don't need the regular expression features, you can use indexOf :

if (string1.toLowerCase().indexOf(stringtarget.toLowerCase()) >= 0) {
    // It's in there
}

Otherwise (and I'm guessing you're using match for a reason!), you'll have to pre-process the stringtarget to escape any special characters.

For instance, this is a function I used in a recent project to do exactly that, which is inspired by a similar PHP function:

if (!RegExp.escape) {
    (function() {
        // This is drawn from http://phpjs.org/functions/preg_quote:491
        RegExp.escape = RegExp_escape;
        function RegExp_escape(str) {
            return String(str).replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!<>\|\:])/g, '\\$1');
        }
    })();
}

And so:

var match = string1.match(RegExp.escape(stringtarget),"ig");

Answer 2

您可以使用preg_quote javascript端口转义正则表达式特定的字符。