Hi Jason,
@ 2:40:34 AM on 4/20/2001, Jason Caldwell wrote:
> I'm a little lost as to the exact function of the following:
> ^ and $
^ beginning of a string.
$ end of a string.
> I noticed in the example below... that when I added the $ to the end of the
> expression, I wasn't able anymore to put a non-alphanumeric character in the
> end, for example (without the $)
> I was able to enter the following and get a 'match'
> aaa.a! <-- matched
Matches the expression with one or more alnum's before the \. and one
or more after the \.
! is [:punct:]
> aaa.! <-- no match
No alnum after the \. If you want to match that, replace the + with a
*
> after I put the $ on the end
> aaa.a! <-- no match
Doesn't match the expression \.[[:alnum:]]+$
> aaa.aa32 <-- match...
> So, am I to understand that the ^ and $ are used to tell the expression that
> it *must* match what the expression expects?
Yep; more precisely, ^[something]$ matches the whole string.
-Brian
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