exclude underscore from alpha numeric regex

Question

I want use \\w regex for to allow alpha numeric but I don\'t want underscore _ to be part of it. Since _ is included in \\w

Answer 1

Your proposed solution:

(/^roger\w{2,3}[0-9a-z]/i)

Means:

\w{2,3} -- 2 or 3 alphanumeric, including the _

[0-9a-z] (with the /i) -- a single character that is alphanumeric, not including the _

I didn't see any mention of the acceptable 3 alphanumerics at the beginning. Does that belong?

Both "roger54" and "roger4a" should fail this because the above regex requires at least three characters following "roger." Likewise, "roger_a" would succeed because "_" passes \w{2,3} (specifically \w{3}).

Your request sounded like you wanted more of one of these:

/^roger[0-9a-z]+/i
/^roger[0-9a-z]*/i

that is, "roger" (case insensitive) followed by one or more (+) or zero or more (*) letters and/or numbers.