Hi
As I said before I don't use posix regexes (i.e. ereg), as they're not
binary safe and can be much slower than the PCRE versions. the PCRE
equivalent of what you want is:
if (preg_match("/^[-A-Za-z0-9_' ]+$/", $string)}:
echo "string valid";
else:
echo "string invalid";
endif;
The "A-Za-z0-9_" can be simplified to "\w" meaning any 'word'
character.
The slashes '/' are required as delimeters around a regex with PCRE.
The '^' and '$' anchor to beginning and end. This makes sure you're
testing the whole string not just a part of it, otherwise it would match
up to the first invalid character but still make a match.
I use this kind of test frequently myself, so I know it is possible
and fairly simple to do.
Niel
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