Single digit followed by two alphabets regex [closed]

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I am new to regular expression. I need a regular expression to validate single digit within range of [1-5] followed by alphabet [A-C] and followed by optional alphabet [X-Z]

• 1A (Valid)
• 2BZ (Valid)
• 7B (Invalid)

Answer 1

What you tried is right, except you're missing the start and end characters, so it's succeeding on a partial match.

You need:

^[1-5][a-cA-C][x-zX-Z]?$

Answer 2

Use online testers to validate it:

[1-5]+[A-C]+[X-Z]*

regexpal

gskinner