php - Removing word + wildcard number from string -

i have string is

$str = "testingsub1"; 

how can strip out sub* string? assume using preg_replace i'm not matching want regex.

does know how can this?

thank you

that's way.

$str = preg_replace("#sub[0-9]+#", "", $str); 

the #s delimiters; can non-alphanumeric/whitespace/backslash character doesn't appear in pattern. [0-9] means digit (you can use \d in languages, don't bother), , + means 1 or more of previous, if take + out replace first digit