javascriptUse variable as regex

var regex = new RegExp('[0-9]+', 'g');
var matches = 'test_str_1'.match(regex);ctrl + cyoutubegithub

`var regex` declares new regular expression from string	`'[0-9]+'` string representation of our regular expression
`'g'` which modifiers to use (global in this case)	`matches` will contain an array of found matches
`'test_str_1'.match(regex)` matches text string `'test_str_1'` agains our `regex` regular expression