01-18-2013
Quote:
Originally Posted by
radoulov
Your regular expression matches: zero or more occurrences of [0-9] followed by a literal dot ., followed by zero or more occurrences of [0-9].
The == / != operators in ksh don't support regular expressions, but only shell pattern matching.
As I already said, check if your ksh version supports the =~ operator (but I doubt, if it's really an x88 implementation).
You should also modify the pattern (if used as a regular expression) to restrict the matching (see the examples in the previous two posts).
If your shell doesn't support regular expressions, use grep, as balajesuri suggested (you may need to use > /dev/null
instead of -q with some grep implementations.
Thank you for explaining. If my shell doesnt support regular expressions why does some of the regular expression work in my code? The =~ didnt work by the way. I will try usng the grep example instead but how would I make a single dot optionally instead of mandatory, would it be \? after the dot?
Thanks
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REGEXP(6) Games Manual REGEXP(6)
NAME
regexp - regular expression notation
DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular
expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular
expressions the word `character' means any character (rune) but newline.
The syntax for a regular expression e0 is
e3: literal | charclass | '.' | '^' | '$' | '(' e0 ')'
e2: e3
| e2 REP
REP: '*' | '+' | '?'
e1: e2
| e1 e2
e0: e1
| e0 '|' e1
A literal is any non-metacharacter, or a metacharacter (one of .*+?[]()|^$), or the delimiter preceded by
A charclass is a nonempty string s bracketed [s] (or [^s]); it matches any character in (or not in) s. A negated character class never
matches newline. A substring a-b, with a and b in ascending order, stands for the inclusive range of characters between a and b. In s,
the metacharacters an initial and the regular expression delimiter must be preceded by a other metacharacters have no special meaning and
may appear unescaped.
A matches any character.
A matches the beginning of a line; matches the end of the line.
The REP operators match zero or more (*), one or more (+), zero or one (?), instances respectively of the preceding regular expression e2.
A concatenated regular expression, e1e2, matches a match to e1 followed by a match to e2.
An alternative regular expression, e0|e1, matches either a match to e0 or a match to e1.
A match to any part of a regular expression extends as far as possible without preventing a match to the remainder of the regular expres-
sion.
SEE ALSO
awk(1), ed(1), sam(1), sed(1), regexp(2)
REGEXP(6)