CODEWITHSUNDEEP
regex
lovin
lovin

Reputation: 563

Issue with common Regex for alphabets and numbers

I am using the following regex - [a-zA-Z0-9]{9,18} which means I can use alphabets and numbers with minimum length as 9 and maximum length as 18. It should not take special characters. It takes values like ADV0098890 etc. but it is also taking ADV0098890[], which is wrong.

How can I prevent that?

Upvotes: 1

Views: 39

Answers (1)

user12341234
user12341234

Reputation: 7213

Your regex is matching only the first part of the string. Try wrapping the pattern in ^$:

>> !!('ADV0098890'   =~ /[a-zA-Z0-9]{9,18}/)
=> true
>> !!('ADV0098890[]' =~ /[a-zA-Z0-9]{9,18}/)
=> true
>> !!('ADV0098890'   =~ /^[a-zA-Z0-9]{9,18}$/)
=> true
>> !!('ADV0098890[]' =~ /^[a-zA-Z0-9]{9,18}$/)
=> false

Upvotes: 1

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