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Regex for a string that consists of 1 to 4 non-zero numeric characters or 1 to 4 non-zero numeric characters and 1 alphabet

I'm writing a regex for strings that are 1 to 4 non-zero numeric characters, or 1 to 4 non-zero numeric characters and 1 alphabet, but I'm stuck on how to fix the length of the alphabetic characters to one.

"(^[1-9]{1,4}$|^[[a-zA-Z][1-9]{1,4}]$)"

I've tried this path, but it doesn't work; it only checks for strings of 1 to 4 non-zero numeric characters.

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^(?:\d{1,4}|(?=\d*[a-zA-Z]\d*$)[\da-zA-Z]{2,5})$

For this you need lookahead

. See demo.



https://regex101.com/r/eX9gK2/2

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Generally, your best chance is to check your regex with an online tool like http://www.regexr.com/ .

Also, what you are trying to achieve can be done like this: ([a-zA-Z]?[1-9]{1,4})



Explanations:

  • [a-zA-Z]

    Means az alphabetic character
  • ?

    Means 0 or 1 of the previous set (which was not in your test)
  • [1-9]{1,4}

    A means of 1 to 4 numeric characters as you mentioned.
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