Question

Rules for the regex in english:

• min length = 3
• max length = 6
• only letters from ASCII table, non-numeric

My initial attempt:

[A-Za-z]{3-6}

A second attempt

\w{3-6}

This regex will be used to validate input strings from a HTML form (i.e. validating an input field).

Answer 1

A modification to your first one would be more appropriate

\b[A-Za-z]{3,6}\b

The \b mark the word boundaries and avoid matching for example ‘abcdef’ from ‘abcdefgh’. Also note the comma between ‘3’ and ‘6’ instead of ‘-‘.

The problem with your second attempt is that it would include numeric characters as well, has no word boundaries again and the hypen between ‘3’ and ‘6’ is incorrect.

Edit: The regex I suggested is helpful if you are trying to match the words from some text. For validation etc if you want to decide if a string matches your criteria you will have to use

^[A-Za-z]{3,6}$