preg_match regex and single quotes

[monkeytooth]

$pattern = '#^[a-z0-9\x20]+$#i'; if(preg_match($pattern, $ChkqString)

 

So far I have all I want to do with this regex statement working (alphanumeric with spaces allowed) but I want to also allow single quotes cause some of the search terms I need to allow people to look up contain a ' in it. (alternatively is there a way to block multiple instances of ' back to back?

 

Im not good with regex, so any help i would appreciate

[cags]

Adding support for single quotes is as simple as placing one in the character set (just bare in mind that since your string is delimited by single quotes you will need to escape it). If you really want to allow only 1 in a row it will complicate the pattern rather a lot but I'm sure is possible.

 

'#^[a-z0-9\x20\']+$#i'

[monkeytooth]

Don't really want to allow only one per row, but not allow ' x2 like '' but if its going to complicate things I can most likely just use something else to search specificly for tht in the string after the string runs through preg_match

 

delimiting by double quotes inst a problem either, I should probably do that anyway to prevent php from trying to say something is when its not. like the $

[cags]

Something like this should do the job...

 

"#^(?:[a-z0-9 ]|(?<!')')+$#i";