[Info-vax] OpenVMS - DCL - Data entry filtering

[mcleanjoh at gmail.com]

It's an interesting problem testing every character of input against every character that's not permitted.  Almost whichever way you do it there are multiple passes through one string (eg. using f$locate on the input string).

JFM has an interesting alternative solution that involves a single pass through the main string and replacing the characters each time.  It's got to be more efficient than multiple passes.

Maybe there's a use for a "test for characters" function or program, with arguments of a main string and a string/list of disallowed characters.