Can't have only digits in URL subpart sequence

Question

I want to change regex so it matches if class group doesn't have only digits between two slashes:

$regex = "~^upload/(?<class>[/a-z0-9_\.]+)/(?<id_table>\d+)$~";

preg_match($regex, "upload/.bes/.ur/13"); // returns true
preg_match($regex, "upload/.tables/fewf/.u23ser/15"); // returns true
preg_match($regex, "upload/.t/les2/.uer/11"); // returns true
preg_match($regex, "upload/1.tales/.user2/01"); // returns true

preg_match($regex, "upload/23/21"); // returns false
preg_match($regex, "upload/.tables/00/31"); // returns false
preg_match($regex, "upload/6/.uer/q/51"); // returns false

Answer 1

You may use

$regex = "~^upload/(?<class>(?!\d+/)[a-z0-9_.]+(?:/(?!\d+/)[a-z0-9_.]+)*)/(?<id_table>\d+)$~";

See this regex demo.

The class named group pattern matches

• (?!\d+/)[a-z0-9_.]+ - one or more lowercase ASCII letters, digits, _ or ., but not if all these chars are digits
• (?:/(?!\d+/)[a-z0-9_.]+)* - zero or more repetitions of
  • / - a / char
  • (?!\d+/)[a-z0-9_.]+ - one or more lowercase ASCII letters, digits, _ or ., but not if all these chars are digits