regex - Javascript Regexp dynamic generation from variables? -

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how construct 2 regex patterns one?

for example have 1 long pattern , 1 smaller, need put smaller 1 in front of long one.

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

this doesn't work. when i'm concatenating strings, slashes gone.

you have use regexp:

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

when i'm concatenating strings, slashes gone.

if have backslash in pattern escape special regex character, (like \(), have use two backslashes in string (because \ escape character in string): new regexp('\\(') same /\(/.

so patterns have become:

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

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