Re: Regular Expressions

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Don Don wrote:
> Hi all, am trying to run a regular expression to a list of user entered data on some forms.
> 
> I've creating what i think is a matching pattern for each category as shown below:
> 
> function validateEntry($regularExpression, $fieldValue)
> {
>     if(preg_match($regularExpression, $fieldValue))
>     {
>         return "true";
>     }
>     else
>     {
>         return "false";
>     }
> }
> 

this function sucks - it does nothing more than wrap preg_match and
returns strings instead of boolean values.

regexp's become hard very quickly - but for simple checks like your
doing your probably better off using the functions in the ctype
extension:

	http://php.net/ctype

> i made a list of rules that are passed into the function above
> 
> 1)  [a-zA-Z][0-9] //allow any characters and numbers together anywhere within the text
> 2)  [a-zA-Z]      //allow only any charaters in the text
> 3)  [0-9]{2}      //allow only digits and they must be 2 in length
> 4)  [a-zA-Z]{1}   //allow only 1 character either uppercase or lowercase
> 
> 
> but each of these fail the validation when data is entered appropriately , seems iam getting something wrong.

how exactly do you define these regexps? seems like your forgetting to add a start/end delimiting
character to the regexp strings (as others have pointed out).

> 
> 
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