How to put a variable in my JS regular expression?

Asked Nov 21 '18 at 13:09

Active Nov 21 '18 at 13:09

Viewed 30 times

this is my regex:

/^(\d|\d{2,}):node_type$/gm

But I need to parameterizing it with

var myVar = "a value";
var regex = /^(\d|\d{2,}):+myVar+$/gm;

I know this is not possibile in this way and I know that I need to using:

var regex = new RegExp(...);

So my question is how can I use RegExp to parameterizing my regex with myVar?

asked Nov 21 '18 at 13:09

Fobi

1

`var regex = new RegExp("^\\d+:"+myVar+"$", "gm");`. But you might want to escape the `myvar`, too. – Wiktor Stribiżew Nov 21 '18 at 13:12
Why have you changed my regex from /^(\d|\d{2,}):node_type$/gm to /^\d:node_type$/gm ? – Fobi Nov 21 '18 at 13:15
1

Because that is what it looks like after you realize `(\d|\d{2,})` = `\d+`. – Wiktor Stribiżew Nov 21 '18 at 13:16

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