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/[A-Z0-9]+[A-Z0-9]+[A-Z0-9]{1}/i

/[A-Z0-9]{3,}/i

/\w{3,}/

/^            # match the start of the line
 [A-Z0-9]{3,} # match at least 3 alnums, beginning at the start of the
+ line
 $            # match the end of the line -- we've only matched alnums
 /xi;

/^[A-Z0-9]{3,}$/i;