10-29-2012
If you want to process REs for characters that are not in the portable character set defined by the C and POSIX standards, you have to be sure that the characters you're looking for exist in your current locale. The character '¿' is not in the portable character set defined by C and POSIX. You probably want a Spanish or Portuguese locale if that character is present in your data. You haven't said anything about what system you're using, but I probably can't help here. You need to talk to your system administrator to find out what locales have been installed on your system that support the languages and character sets you're using in your data. (Note that there is nothing wrong with the awk script, the problem is the environment in which it is being run.) To find out what locale you're using, run the command:locale. If the setting of LC_COLLATE reported is something like LC_COLLATE="en_US.UTF-8", '¿' is probably not a collating element in your current locale.
Note also that I am not offering to localize the error messages from this awk script for you to produce diagnostic messages in anything other than English.
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