regex - Regular Expression to validate the field: field must contain atleast 2 AlphaNumeric characters -

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i need validate varchar field. conditions are: field must contain atleast 2 alphanumeric characters

so please 1 give regular expression above conditions

i wrote below expression check atleast 2 letters alphanumeric. , if input have other alphanumeric nt validating.

'^[a-za-z0-9]{2,}$'

please help.........

[a-za-z0-9].*[a-za-z0-9]

the easy way: @ least 2 alnum's anywhere in string.

answer comments
never did (nor intended do) benchmarking. therefore - , given know nothing of op's environment - not 1 judge whether non-greedy version ([a-za-z0-9].*?[a-za-z0-9]) more efficient. do believe, however, performance impact totally negligible :)


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