passing variable to javascript regexp: combination of variable and regexp pattern

问题:

I need to pass variable into RegExp

form = form.replace(/someVar\_\d+/g, someVar+"_"+num) 

I read this question, but there is not a combination of regular expression (like \d+) and a string variable:

How do you use a variable in a regular expression?

And I can use eval here, but I want to avoid it

回答1:

You're looking for almost the same thing the question shows:

var r = new RegExp(someVar + "_\\d+","g"); 

Two minor notes:

• You may want to escape regexp meta-characters that may be present in someVar.
• Note "\\d+" is a string, so you have to escape the backslash.

回答2:

I'm assuming you are asking how to escape your string so it isn't interpreted as regex.

http://simonwillison.net/2006/Jan/20/escape/ should be what you are looking for then.

文章来源: passing variable to javascript regexp: combination of variable and regexp pattern