# Backslash in regex strings in JavaScript

In strings with regexes, you need to escape (actually double) backslashes. Let's look at an example. Let's say we have the following string:

`let str = 'xyz';`

Let's say we have the following code with regex:

`let reg = /\w+/; let res = str.match(reg);`

Let's convert the regular expression to a string. In this case, we have a problem with the backslash:

`let reg = new RegExp('\w+'); // doesn't work let res = str.match(reg);`

To solve the problem, double the backslash:

`let reg = new RegExp('\\w+'); // works let res = str.match(reg);`

## Practical tasks

Convert a regex to string:

`let str = 'x1y x12y x123y'; let reg = /x\d+y/; let res = str.replace(reg, '!');`

Convert a regex to string:

`let str = 'x.y xay xby'; let reg = /x\.y/; let res = str.replace(reg, '!');`

Convert a regex to string:

`let str = 'x\\y'; let reg = /x\\y/; let res = str.replace(reg, '!');`
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