JavaScript regex for one letter and three number regex three letter word,regex three letter month,regex three

If the combination can be in any order, you may need to list the alternatives explicitly, depending on what your regex flavour supports:

^([a-zA-Z]\d{3}|\d[a-zA-Z]\d{2}|\d{2}[a-zA-Z]\d|\d{3}[a-zA-Z])$
Answer:1

Please check below expression as per your requirement

(?=(?:.*\d){3})(?=(?:.*[a-zA-Z]){1})^[a-zA-Z\d]*$

Breakdown:

Look for at least 3 digits:

(?=(?:.*\d){3})

Look for at least 1 letters:

(?=(?:.*[a-zA-Z]){1})

Define what is allowed between the start and end:

^[a-zA-Z\d]*$

you can check example here.

Answer:2

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