hello,
Example with [[:alnum:]] I found in post http://www.tek-tips.com/viewthread.cfm?qid=1699291 is not working good in case german letters Ä/ä, Ö/ö, Ü/ü are in a string:
# echo 243dÜdd|awk '$1 !~ /^[[:alnum:]]+$/ {print "notalnum"}'
# echo 243dÜdd|awk '$1 !~ /^[a-zA-Z0-9]+$/ {print...