Appendix A. SSH2 Manpage for sshregex

Description

Patterns

*

Match any string consisting of zero or more characters. The characters can be any characters apart from slashes ( / ). However, the asterisk does not match a string if the string contains a dot (.) as its first character, or if the string contains a dot immediately after a slash. This means that the asterisk cannot be used to match filenames that have a dot as their first character.

If the previous character is a slash ( / ), or the asterisk (*) is used to denote a match at the beginning of a string, it does match a dot (.).

That is, the "*" functions as is normal in UNIX shell fileglobs.

?

Match any single character except for a slash ( / ). However, do not match a dot (.) if located at the beginning of the string, or if the previous character is a slash ( / ).

That is, "?" functions as is normal in Unix shell fileglobs (at least ZSH, although discarding the dot may not be a standard procedure).

**/

Match any sequence of characters that is either empty, or ends in a slash. However, the substring "/." is not allowed. This mimics ZSH's ingenious **/ construct. (Observe that "**" is equivalent to "*".)

E#

Act as Kleene star, match E zero or more times.

E##

Closure, match E one or more times.

(

Start a capturing subexpression.

)

End a capturing subexpression.

E|F

Disjunction, match (inclusively) either E or F. E is preferred if both match.

[

Start a character set. (See below).

Character Sets

- (minus sign)

A range operator, except immediately after "[", where it loses its special meaning.

^ or !

If immediately after the starting "[", denotes a complement: the whole character set will be complemented. Otherwise literal. "^".

[:alnum:]

Characters for which "isalnum" returns true (see ctype.h).

[:alpha:]

Characters for which "isalpha" returns true (see ctype.h).

[:cntrl:]

Characters for which "iscntrl" returns true (see ctype.h).

[:digit:]

Characters for which "isdigit" returns true (see ctype.h).

[:graph:]

Characters for which "isgraph" returns true (see ctype.h).

[:lower:]

Characters for which "islower" returns true (see ctype.h).

[:print:]

Characters for which "isprint" returns true (see ctype.h).

[:punct:]

Characters for which "ispunct" returns true (see ctype.h).

[:space:]

Characters for which "isspace" returns true (see ctype.h).

[:upper:]

Characters for which "isupper" returns true (see ctype.h).

[:xdigit:]

Characters for which "isxdigit" returns true (see ctype.h).

Example

[[:xdigit:]XY] is typically equivalent to
[0123456789ABCDEFabcdefXY] .

Authors