Javascript RegExp and boundaries

Question

A colleague asked me about a Regular expression problem, and I can\'t seem to find and answer for him.

We\'re using boundaries to highlight certain lengths of text i

Answer 1

In fact you have to backslash everything in the string passed to the RegExp constructor :

var re = /my_([\w_]+-\d-)regexp/

is equivalent to :

var re = new RegExp("my_\(\[\\\w_\]+-\\\d-\)regexp")

And both match the following stupid example :

"my_very_obvious-4-regexp".match(re)
["my_very_obvious-4-regexp", "very_obvious-4-"]