Regex to allow only number between 1 to 12

Question

Regex to allow only number between 1 to 12

I am trying (12)|[1-9]\d? but its not working, please help as i am new to regular expression

Answer 1

Something like

^([1-9]|1[012])$

• ^ Anchors the regex at start of the string

• [1-9] Matches 1 to 9

• | Alternation, matches the previous match or the following match.

• 1[012] Matches 10, 11, or 12
• $ Anchors the regex at the end of the string.

Regex Demo