BACKSLASHEDP

Synopsis
BACKSLASHEDP character
BACKSLASHED? character
Description

Outputs TRUE if character was originally entered with a backslash (\) before it or between vertical bars (|) to prevent its usual semantic meaning. Outputs FALSE, otherwise.

That is, it outputs TRUE if only if character is a backslashed space, tab, newline, or one of ()[]+-*/=<>":;\~?.

Example
SHOW BACKSLASHEDP "a
false
SHOW BACKSLASHEDP "|(|
true

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