Safe Haskell | Safe-Inferred |
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# Documentation

`[..]`

- Matches any of the enclosed characters. Ranges of characters can
be specified by separating the endpoints with a
`'-'`

.`'-'`

or`']'`

can be matched by including them as the first character(s) in the list. Never matches path separators:`[/]`

matches nothing at all. Named character classes can also be matched:`[:x:]`

within`[]`

specifies the class named`x`

, which matches certain predefined characters. See below for a full list. `[^..]`

or`[!..]`

- Like
`[..]`

, but matches any character*not*listed. Note that`[^-x]`

is not the inverse of`[-x]`

, but the range`[^-x]`

. `<m-n>`

- Matches any integer in the range m to n, inclusive. The range may
be open-ended by leaving out either number:
`"<->"`

, for instance, matches any integer. `**/`

- Matches any number of characters, including path separators, excluding the empty string.

Supported character classes:

`[:alnum:]`

- Equivalent to
`"0-9A-Za-z"`

. `[:alpha:]`

- Equivalent to
`"A-Za-z"`

. `[:blank:]`

- Equivalent to
`"\t "`

. `[:cntrl:]`

- Equivalent to
`"\0-\x1f\x7f"`

. `[:digit:]`

- Equivalent to
`"0-9"`

. `[:graph:]`

- Equivalent to
`"!-~"`

. `[:lower:]`

- Equivalent to
`"a-z"`

. `[:print:]`

- Equivalent to
`" -~"`

. `[:punct:]`

- Equivalent to
`"!-/:-@[-`{-~"`

. `[:space:]`

- Equivalent to
`"\t-\r "`

. `[:upper:]`

- Equivalent to
`"A-Z"`

. `[:xdigit:]`

- Equivalent to
`"0-9A-Fa-f"`

.