In addition to the regular expression notations discussed above, the
Korn Shell provides its own syntax. The metacharacters used by this
syntax are similar to those used by the generic regular expression
handling notations:
Operator
Meaning
(regexp)
matches 0 or more instances of regexp
+(regexp)
matches 1 or more instances of regexp
?(regexp)
matches 0 or 1 instances of regexp
@(regexp1|regexp2|. . .)
matches regexp1 or regexp2 or . . .
!(regexp)
matches any string except regexp
The OR notation given for the @ metacharacter can be
combined with any of the other metacharacters. For example,
@(apple|pear|kumquat)
matches ``apple'' or ''pear'' or ``kumquat'', while
!(apple|pear|kumquat)
matches any string except ``apple'' or ''pear'' or ``kumquat''.
(regexp)