Trim letters from the end of a string

Question

I am trying to write a function that will trim all the letters off the end of a string, upto the first number it hits.

I have child product names like, item101S, item101xxx, etc. and I want to output only the parent product name: item101.

Not sure if I should be using regular expressions or !is_numeric() or what.

Answer 1

php > $s="item101xxx";
php > $pattern="/[^\d]*\d+/";
php > echo preg_match($pattern, $s, $m);
1
php > print_r($m);
Array
(
    [0] => item101
)