/(^[a-zA-Z]+-?[a-zA-Z0-9]+){5,15}$/g
regex criteria
match length must be between 6 and 16 characters inclusive
must start with a letter only
must contain letters, numbers and one optional hyphen
must not end with a hyphen
the above regular expression doesnt satisfy all 4 conditions. tried moving the ^
before the group and omitting the +
quantifiers but doesnt work
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