Pattern: Control characters

“Control characters” is one of the patterns that you can select on the Match panel. Use this pattern to restrict a field to a certain set of ASCII control characters. The repetition settings for the field determine how many characters the field can or must match.

Control Characters

Select the ASCII control characters that this field should match.

Match All Characters Except The Selected Ones

Turn on to make the field match any character except those that you specified.

Turn off to make the field match only those characters that you specified.