Javascript. Problems with making regexp object from working regex

Question

I have a string in my js code, that actually is an html code. It's started with <li class='list__item item item_archive'> This works fine:

liMatches=s.match(/(<li[A-Za-z\s_=\']+>...$/);

where s is html string. Now I need to use RegExp object.

liMatchesRegex=new RegExp("<li[\s]+");

I create this object (I tried <li[A-Za-z\s_=\']+> too).

liMatchesConcat=s.match(liMatchesRegex);

shows me null It works only with liMatchesRegex=new RegExp("<li"); What's wrong?

Robby Cornelissen · Accepted Answer · 2015-07-28 09:39:38Z

1

You can just create the RegExp object using the literal notation:

var re = /<li[\s]+/;

Alternatively, if you want to use the constructor and pass in a string, you need to escape the backslashes (\\) in your expression:

var re = new RegExp('<li[\\s]+');

edited Jul 28, 2015 at 9:39

answered Jul 28, 2015 at 9:34

Robby Cornelissen

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1 Comment

Sergey Scopin Over a year ago

I can't use literal notation because I need a concatination of regex. As I found here: stackoverflow.com/questions/185510/… It's only possible with regexp object. So I see, I should use two backslashes instead of one. Gonna check it.

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