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__NAME__ purpose
return "f" (false) or "t" (true), depending on input data
__NAME__ see also
__NAME__ description
The filter returns "<literal>f</literal>" (false) if the input is
undefined, <literal>0</literal>, <literal>f</literal> or
<literal>false</literal> (in a case-insensitive manner).
Otherwise, it returns "<literal>t</literal>" (true).
__NAME__ notes
For more information on &PERL; Regular Expressions, pattern matching and
character classes, see
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