find an unspecific substring

[robcrozier]

Hi, i wonder if anyone could tell me how i could find a non specific substring of a given string.  Basically i want to find a 5-digit integer value within a long string.  I know that there will only be one 5-digit integer within the string so i suppose this makes it possible, i'm just not sure how to go about it?

 

I know that substr() will work if you know what the substring actually is (i.e '12345' as oppose to a 5-digit unspecified integer)

 

Any suggestion would be great as it's doing my head in.

 

Thanks

[tinker]

look at this and that, also any of the others, then try something like:

if (preg_match("/[0-9]/",$s))
{
    echo "A match was found.";
} else {
    echo "A match was not found.";
}

There is a regex forum here somewhere...