Character classes
A character class is used to match a single character to a set of possible characters. A character class is denoted using square brackets ([ ]).
For example, a character class may contain each of the vowels:
'get' -match 'g[aeiou]t'
'got' -match 'g[aeiou]'
Within a character class, the special or reserved characters are as follows:
-: Used to define a range\: Escape character^: Negates the character class
Ranges
A hyphen is used to define a range of characters, for example, to capture any number of characters repeated one or more times in a set (using +):
'1st place' -match '[0-9]+' # $matches[0] is "1"
'23rd place' -match '[0-9]+' # $matches[0] is "23"
A range in a character class can be any range of ASCII characters, such as the following examples:
- a-z
- A-K
- 0-9
- 1-5 ...