Question

I need to validate VARCHAR field.
conditions are: field must contain atleast 2 AlphaNumeric characters

so please any one give the Regular Expression for the above conditions

i wrote below Expression but it will check atleast 2 letters are alphanumeric. and if my input will have other than alphanumeric it is nt validating.

‘^[a-zA-Z0-9]{2,}$’

please help………

Answer 1

[a-zA-Z0-9].*[a-zA-Z0-9]

The easy way: At least two alnum’s anywhere in the string.

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Answer to comments
I never did (nor intended to do) any benchmarking. Therefore – and given that we know nothing of OP’s environment – I am not one to judge whether a non-greedy version ([a-zA-Z0-9].*?[a-zA-Z0-9]) will be more efficient. I do believe, however, that the performance impact is totally negligible 🙂