The issue was therefore resolved by specifying the flag "RegexOptions.CultureInvariant" in the call to Regex.IsMatch which would then correctly yield a list of matching variable tags. By default however, when the regular expression engine performs case-insensitive comparisons, it uses the casing conventions of the current culture to determine equivalent uppercase and lowercase characters. Commands can be issued manually, through an operator typing a key sequence, or by clicking on a button (or object. Each command has a mechanism to activate it. You use commands to control your Citect SCADA system and therefore the processes in your plant. Searching for variable tags is implemented using Regex expressions to find a match in the input string, which in this case comprises of tag field names, such as "iodev". Cicode commands extend the control element of a Citect SCADA control and monitoring system. This was due to the way in which the letter "i" is treated in Turkish where the uppercase variant is the dotted "?", as opposed to the lack of a dot in English. When a customer was operating CitectSCADA under the Turkish locale or had manually set the regional format of their machine to "Turkish (Turkey)" a variable tag search in Process Analyst would result in error code 0x1000019E and no matching tags would be returned.
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