Regex with variables in it

Question

/^([A-Za-z0-9]){1,8}$/

This is a normal way to write a regex in JavaScript but I want to construct the regex dynamically with a variable in between ().

Variable = [A-Za-z0-9]

What do you mean with a variable in between? – lilezek Aug 17 '17 at 18:28 — lilezek, Aug 17 '17 at 18:28
tell us an example of what does this regex. – Just Me Aug 17 '17 at 19:08 — Just Me, Aug 17 '17 at 19:08

score 5 · Answer 1 · answered Aug 17 '17 at 18:31

5

This is how you can build a new regular expression from string:

var v = '[A-Za-z0-9]';
var regExp = new RegExp('^(' + v + '){1,8}$');
console.log(regExp);

Now you can use the regular expression regExp in your purpose

answered Aug 17 '17 at 18:31

1 Answers1