Several filters in a regex

Question

I need to validate a field input which may have the following formats:

`D-1` ou `D-10` ou `D-1_1` ou `D-10_1` ou `D-1A` ou `D-10A`

Letters and numbers may vary, but they will always have one of these formats.

Answer 1

Use that regex:

([a-zA-Z]+-\d+_{0,1}[a-zA-Z0-9]*)

Explanation:

• [a-zA-Z]+ Validates if there is one or more of a letter.
• - Validates if there is a character - after the letter.
• \d+ Validates if there is one or more.
• _{0,1} Checks if after the previous sequence there is the character _ if it exists it enters the capture group.
• [a-zA-Z0-9]* Checks for letters or numbers after _, if such characters exist enter the capture group.

You can see how this regex works here.