Gurus!

I am working on a web interface for creating a new user
profile. Wondering what is the industry standard for
acceptable a user id and password beside being just
alphanumeric (a-zA-Z0-9_)? Actually I am looking for what
are the allowable special characters that can be
used for user id and passwords besides being
alphanumeric in type.

Next, how can I construct such a pattern matching?

Thanks in advance!

In reply to What are acceptable web user id & password? by tariqahsan

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