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a2b5d6u6
s2t6t6o6
e8a9i6v9
4 letter 4 nummer total = 8 car wordy except catch?
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a2b5d6u6
s2t6t6o6
e8a9i6v9
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/spamfilter add u gline - Go_away ^((?-i)[a-z](?i)[0-9]){4}!
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([[:alpha:]][[:digit:]]){4}
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[^([[:alpha:]][[:digit:]]){4}]