Square brackets [ ]

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

When you include a series of characters in brackets, your expression matches 1 of those characters.

For example, the expression PART[123] matches:

• PART1
• PART2
• PART3

The expression doesn’t match:

• PART12
• PART23
• PART123

Hyphen -

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 above, 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)

* Nguồn: Google Analytics