Give certain character(s) as variables in JavaScripts "replace"-function

Question

I'm trying too use JavaScripts "replace"-function to put tags around text given in between certain characters. Example:

str.replace(/\_(.*?)\_/gi, '<u>$1</u>');

Now this works fine but I want the "_"-characters to be given as a variable. For example:

var und = "_";
str.replace(/\und(.*?)\und/gi, '<u>$1</u>');

My question is how can I do that?

Thnx in advance!

@depperm What are you talking about?? – epascarello Jul 08 '15 at 15:52 — epascarello, Jul 08 '15 at 15:52

score 1 · Accepted Answer · answered Jul 08 '15 at 15:50

1

You will need to use RegExp constructor to construct a regex from variable:

var und = "_";
var re = new RegExp(und + '(.*?)' + und, "gi");

var repl = str.replace(re, '<u>$1</u>');

answered Jul 08 '15 at 15:50

anubhava

score 0 · Answer 2 · answered Jul 08 '15 at 15:50

0

You want to use new RegExp(pattern, flags) to build the regular expression from a string.

answered Jul 08 '15 at 15:50

epascarello

2 Answers2