How to append regex literal with string literal in javascript

Question

Can i append regex literal with string literal in javascript ? Like this:

var str = "iam 91 old";
var query = 'old';
var reg = /(\d+\s + query +)/;
alert(reg.exec(str)[1]);

this cod will be error.

Denys Séguret · Accepted Answer · 2013-06-17 12:49:46Z

3

Don't use a literal.

Use the RegExp constructor :

var reg = new RegExp("(\\d+\\s" + query + ")");

answered Jun 17, 2013 at 12:49

Denys Séguret

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2 Comments

can i call this reg.exec() function in this way?

Yes, it's exactly the same as /(\d+\sold)/