Associate Tefigel processors (subroutines) with text lines matching
regular expressions.
Activate a filter for a given regular expression:
filter <file-reference> <regular-expression>
Deactivate filter previously associated with a regular expression:
filter <file-reference>
When an input line processed by Tefigel matches the <regular-expression>
associated with a filter, a call to the subroutine
specified by means of <file-reference> is automatically issued
by Tefigel, providing as argument the whole text line via
REG_0.
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