# Special characters inside square brackets in JavaScript regex

Special characters inside `[ ]` become regular characters. This means that they don't need to be escaped with a backslash.

## Example

In this example, the search pattern looks like this: any letter `'a'`, `'b'`, `'c'`, or a dot is between `x`'s:

`let str = 'xax xbx xcx xdx x.x x@x'; let res = str.replace(/x[abc.]x/g, '!');`

As a result, the following will be written to the variable:

`'! ! ! xdx ! x@x'`

## Example

In this example, the search pattern looks like this: any small Latin letter or dot is between `x`'s:

`let str = 'xax xbx xcx x@x'; let res = str.replace(/x[a-z.]x/g, '!');`

As a result, the following will be written to the variable:

`'! ! ! x@x'`

## Practical tasks

Given a string:

`let str = 'aba aea aca aza axa a.a a+a a*a';`

Write a regex that will find the `'a.a'`, `'a+a'`, `'a*a'` strings without affecting the others.

Given a string:

`let str = 'xaz x.z x3z x@z x$z xrz';`

Write a regex that matches strings with the pattern: letter `'x'`, then NOT a dot, NOT an AT sign, and NOT a dollar symbol, and then letter `'z'`.

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