error checking, allow apostrophe

[Space_Cowboy]

Hi, I use the following string to validate inputs:

$patternAlphanum1 = "/<sup>[A-Za-z0-9_- ]+$/";

What do I need to add to this to make it allow input of an apostrophe?

Many thanks</sup>

[NogDog]

$patternAlphanum1 = "/^[A-Za-z0-9_\-[color=red][b]'[/b][/color] ]+$/";

🙂

PS: You could shorten up just a tad with:

$patternAlphanum1 = "/^[a-z0-9_' -]+$/i";

The "i" modifier makes it case-insensitive, and if the "-" is the first or last character in a character class, it does not have to be escaped to make it a literal hyphen. You could possibly even replace a-z0-9_ with \w (word character), though it may allow other characters depending on the current locale setting, so that may not be desirable, depending on your requirements.