must_have_filter | topic started 8/15/2004; 4:44:12 PM last post 8/15/2004; 4:44:12 PM |
Michael Gage - must_have_filter 8/15/2004; 4:44:12 PM (reads: 1231, responses: 0) |
Description Filter for checking that an answer has (or doesn't have) a certain string in it. This can be used to screen answers where you want them in a particular form (e.g., if you allow most functions, but not trig functions in the answer, or if the answer must include some string). Syntax must_have_filter(str, yes_no, error_msg) Params First argument is the string to have, or not have Returns a filter ( a subroutine suitable for use in answer evaluators) Examples $new_eval->install_pre_filter(must_have_filter("sin", 'no', "can't use sin() in this answer)); Macro Definition File PGasu.pl
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