perl regex to find any number that is a multiple of 5

Question

Perl regex to find any numbers that is multiple of 5.

I tried using =~ /[5]+/ but it is finding only numbers which contains 5, but not multiple of 5.

And also to find string whose length is multiple of 5.

Answer 1

Numbers that are multiple of 5 either end with 5 or 0.

Try using /^-?\d*[05]$/, which means:

• ^ start of string (saflknfvs34535 won't work).
• -? A minus sign or not (if you only want positive numbers, don't put that).
• \d* numbers, any numbers.
• [05] 0 or 5.
• $ end of string (324655sefgsfgsfg wont' work).