# Modifiers for regex strings in JavaScript

Modifiers in regexes created with `RegExp` should be passed as the second parameter. Let's look at an example. Let's say we have the following string:

`let str = 'abc def';`

Let's apply the following regular expression with a modifier to this string:

`let reg = /[a-z]+/g; let res = str.match(reg);`

Let's rewrite this regular expression using `RegExp`:

`let reg = new RegExp('[a-z]+', 'g'); let res = str.match(reg);`

## Practical tasks

Rewrite a regular expression as a string:

`let str = '123 456 789'; let reg = /[0-9]+/g; let res = str.replace(reg, '!');`
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