Regular expression for a list of items separated by comma or by comma and a space

Question

Hey, I can\'t figure out how to write a regular expression for my website, I would like to let the user input a list of items (tags) separated by comma or by comma and a spa

Answer 1

Assuming the words in your list may be letters from a to z and you allow, but do not require, a space after the comma separators, your reg exp would be [a-z]+(,\s*[a-z]+)*

This is match "ab" or "ab, de", but not "ab ,dc"