## Square brackets \[ \]

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Use square brackets to create a set of characters to match.

When you include a series of characters in brackets, your expression matches one of those characters.

For example, the expression `PART[123]` matches the following:
- PART1
- PART2
- PART3

The expression doesn't match the following:
- PART12
- PART23
- PART123


## Hyphen -

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Use the hyphen along with the brackets to create a range of characters to match.

For example, if you need to match any uppercase letter, you can specify `[A-Z]`.

If you need to match any digit, you can specify `[0-9]`.

If you needed to match all of the part numbers, you could use the following expression:

`[A-Z]+[0-9]+`

- `[A-Z]` (matches any uppercase letter).
- `+` (one or more times).
- `[0-9]` (matches any digit).
- `+` (one or more times).