Re: regular exp if help

On Wed, 23 Aug 2000, Chris Murley wrote: > i tried this code: > > if ( !ereg( "([a-zA-Z0-9])" , $Username) ){ > exit; > } > > it works when i set $Username="'" but if i use > $Username="i'm cool" > > it says thats ok That regex matches any single lower alpha, upper alpha or numeric character. If you are trying to match if there are any characters that are *not* a-zA-Z0-9, you should use the character class negation: [^A-Za-z0-9] That will match any character *not* A-Za-z0-9. So, it will match the single quote in your first example like it should, and the single quote in the second example, too, like it should. The first regex, without the character negation, would match any A-Za-z0-9. Since I'm Cool has six of those matches (I,m,C,o,o,l), it returned true. Hans Anderson ~ me@hansanderson.com PO Box 426, Missoula, MT 59806 | PHP, Search Engines, SQL (800)397-9116 / (406)549-6524 | Databases, Flash Multimedia, http://www.hansanderson.com | Killer Audio Production, http://www.goofiness.com | Minty Fresh Breath.