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float regular expression
Posted: Wed Mar 02, 2005 11:02 am
by dannymc1983
anyone know what the regular expression is for a float number that only allows values of 0.0 to 4.0?
Posted: Wed Mar 02, 2005 11:05 am
by n00b Saibot
I'm not a regex expert but a try
Posted: Wed Mar 02, 2005 11:19 am
by dannymc1983
nope, didnt work. i tried it with this code:
Code: Select all
$val = 2.8;
if (!preg_match('/ї0-4]\.0/', $val))
{
echo "<script language = 'javascript'>alert('"$val" is not a proper float value')</script>";
exit;
}
any other suggestions?
Posted: Wed Mar 02, 2005 11:31 am
by feyd
Code: Select all
#(ї0-3](\.ї0-9]+)?|4(\.0+)?)#

Posted: Wed Mar 02, 2005 11:31 am
by n00b Saibot
oops forgot something. that pattern will match only 1.0,2.0,3.0 and 4.0
try this one
Posted: Wed Mar 02, 2005 1:23 pm
by dannymc1983
feyd, thanks for that but i dont think its working. you'll see if you try running this code:
Code: Select all
<?
$val = -1;
if (!preg_match('#(ї0-3](\.ї0-9]+)?|4(\.0+)?)#', $val))
{
echo "$val is not a proper float value";
}
else
echo "$val is a proper float value";
?>
what i need is just a regex that only accepts values between 0.00 and 4.00 inclusive (ie. 0.00 and 4.00 are allowed values). so it will not accept values such as -1 or 4.1 but will accept 3.22 or 1.97
thanks
feyd | 
Posted: Wed Mar 02, 2005 2:16 pm
by smpdawg
How about this?
Code: Select all
#^(ї0-3](\.ї0-9]+)?|4(\.0+)?)#
Please fix your code tags in your previous post as it helps make it more readable.
Thanks
Posted: Wed Mar 02, 2005 3:22 pm
by feyd
why would you use a regular expression to check an actual number?
works FAR faster..

Posted: Wed Mar 02, 2005 6:40 pm
by dannymc1983
that true i suppose!
thanks for that and what exactly was wrong with my code tags so i know for future reference to my code???
Posted: Wed Mar 02, 2005 6:43 pm
by smpdawg
For some reason the first code tag was missing. It isn't now so I suspect a moderator may have done it for you.
I usually preview before I post because the tags get screwed up sometimes even when I am sure I hit that button.
Posted: Wed Mar 02, 2005 9:54 pm
by feyd
the code tags were reversed.. a la
Posted: Thu Mar 03, 2005 12:30 am
by n00b Saibot
i think me and regexes had a little fight in pre-historic era. they never come to me rightly
