Jochem Maas wrote:
Angelo Zanetti wrote:
Hi guys
Been tryin to figure out regex and have found some tutorials but some
have made things clear and others have confused me.
Anyway for a simple query, if I just wanted to check that a variable
has only text and numeric characters would I do something like this
(i want it to fail if it finds a symbol eg: + - { " etc...):
echo "REG result: " . preg_match('/[a-zA-Z0-9]*/', '{d-fg');
you're on the right path, whats needed is start and end [string] delimiters
in the regexp (note I used a different regexp delimiter, '#', which is
irrelevant):
echo "REG 1 result: ", preg_match("#[a-zA-Z0-9]*#", "{d-fg"), "\n",
"REG 2 result: ", preg_match("#^[a-zA-Z0-9]*$#", "{d-fg"), "\n";
the magic characters are '^' andf '$' as explained in more detail here:
http://php.net/manual/en/reference.pcre.pattern.syntax.php
<quote>
^
assert start of subject (or line, in multiline mode)
$
assert end of subject (or line, in multiline mode)
</quote>
thanks but I think I kinda got working the other way around:
if (!preg_match('/[^a-zA-Z0-9]/', 'gf-5'))
echo "valid";
else
echo "invalid";
then if I wanted to list any symbols I could just change it to:
preg_match('/[^a-zA-Z0-9\,\.]/', 'gf-5'))
if I wanted . and , to be accepted.
tx
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