On 2 June 2010 06:12, Peter <peters@xxxxxxxxxxxx> wrote:
> Hi Tanel,
>
> 1. only letters
>
> $str = 'helloworld';
>
> if(preg_match("/^[a-zA-Z]*$/",$str))
> echo "only letters";
> else
> echo "failed";
>
> 2. only letters and spaces
>
> $str = 'hello world';
>
> if(preg_match("/^[a-zA-Z\s]*$/",$str))
> echo "only letters and spaces";
> else
> echo "failed";
>
>
> Regards
> Peter.M
Be careful with using *.
The issue of a zero length string is important.
* will allow a zero length string.
++ will force the regex to match something, so zero length strings are rejected.
/s will match space, formfeed, newline, carriage return, horizontal
tab, and vertical tab
So a string with newlines (for example a <textarea> with line breaks)
would match.
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