Dynamic making Regexp

Question

I'm looking for a working solution with dynamic regex in Javascript.

this solution works for me: (but is not dynamic)

new RegExp(\bal\i);

but this solution is not working:

var value = 'bal';
new RegExp('\'+value+'\i');

Could anyone help me how to adjust it to make it work? Thank you

Pass a string to RegExp constructor, see what the [docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Description) say ... — Teemu, Nov 16 '15 at 19:39
for example balicekt123@gmail.com but there can be what ever first name or last name — balicekt, Nov 16 '15 at 19:41
yes exactly /bal/i is working for me but I need to change word "bal" for something what will be dynamic what will come to the function like a parameter — balicekt, Nov 16 '15 at 19:45

score 2 · Accepted Answer · answered Nov 16 '15 at 19:48

2

you can pass the string (value) in the RegExp constructor, along with the ignoreCase flag as:

 var value = 'bal';
 var b = new RegExp(value, 'i')
 b.test('BAL')

it returns true.

answered Nov 16 '15 at 19:48

Of course a constructor should be used. People post such questions dozens times a day. – Wiktor Stribiżew Nov 16 '15 at 19:50

1 Answers1