Javascript Regexp dynamic generation from variables? [duplicate]

Question

How to construct two regex patterns into one?

For example I have one long pattern and one smaller, I need to put smaller one in front of long one.

var pattern1 = ':\(|:=\(|:-\(';
var pattern2 = ':\(|:=\(|:-\(|:\(|:=\(|:-\('
str.match('/'+pattern1+'|'+pattern2+'/gi');

This doesn't work. When I'm concatenating strings, all slashes are gone.

Answer 1

You have to use RegExp:

str.match(new RegExp(pattern1+'|'+pattern2, 'gi'));

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When I'm concatenating strings, all slashes are gone.

If you have a backslash in your pattern to escape a special regex character, (like \(), you have to use two backslashes in the string (because \ is the escape character in a string): new RegExp('\\(') would be the same as /\(/.

So your patterns have to become:

var pattern1 = ':\\(|:=\\(|:-\\(';
var pattern2 = ':\\(|:=\\(|:-\\(|:\\(|:=\\(|:-\\(';

Answer 2

Use the below:

var regEx = new RegExp(pattern1+'|'+pattern2, 'gi');

str.match(regEx);