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Regular expression for a floating number

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Jul 01.2008

Hi all Im new to regular expressions so please forgive me. I have a field which is a price of a particular object and I would like to validate that the value is OK. Obviously a price can look like this

45,000.00

what I would like it do is validate that the value has been entered like the above. Is there any examples out there that could do this. I have googled regular expression + floating number + php and various combinations of this and to no avail. I did find something along the following lines

[code=php]if (!(eregi(‘b[0-9]{1,3}(?:,?[0-9]{3})*(?:.[0-9]{2})?b’, stripslashes(trim($_POST[‘price’]))) )) {
$errors[] = ‘<font color=”white”>The overall Price of the Land Investment</font>’;
} [/code]

but this doesnt seem to work.

regards

Mike

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PHP

1 Comments(s) ↴

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@Declan1991Jul 01.2008 — preg* are recommended over ereg*, so maybe something like this:<i>
</i>preg_match("/^d{0,3}(,d{3})*(.d+)?$/",$str);
That presumes there is no white space before or after. For white space before or after the price, use:<i>
</i>preg_match("/^bd{0,3}(,d{3})*(.d+)?b$/",$str);
and if you want to exclude any currency symbol infront of it:<i>
</i>preg_match("/^[^wds]?d{0,3}(,d{3})*(.d+)?$/",$str);
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