pattern match characters support ^Q/^R now as well

* makes it possible, albeit cumbersome, to escape pattern match characters
* For instance, to search for ^Q, you now have to type
  S^Q^Q^Q^Q$.
  To search for ^E you have to type
  S^Q^Q^Q^E$.
  But the last character cannot be typed with carets currently (FIXME?).
  For pattern-only characters, two ^Q should be sufficient as in
  S^Q^Q^X$.
* Perhaps it would be more elegant to abolish the difference between string building
  and pattern matching characters to avoid double quoting.
  But then all string building constructs like ^EQq should operate at the pattern level
  as well (ie. match the contents of register q verbatim instead of being interpreted as a pattern).
  TECOC and TECO-64 don't do that either.
  If we leave everything as it is, at least a new string building construct should be added for
  auto-quoting patterns (analoguous to ^EN and ^E@).

1 files changed, 8 insertions, 0 deletions

diff --git a/doc/sciteco.7.template b/doc/sciteco.7.template
index ca93fa6..81deac0 100644
--- a/doc/sciteco.7.template
+++ b/doc/sciteco.7.template
@@ -1789,6 +1789,14 @@ The following pattern match constructs are supported for matching
 one character in different character classes
 (caret-notations refer to the corresponding control characters):
 .TP
+.BI ^Q c
+.TQ
+.BI ^R c
+Escape character \fIc\fP.
+Since these are interpreted as string building characters as well,
+you may have to type two or three \fB^Q\fP in a row to escape a
+pattern match character.
+.TP
 .SCITECO_TOPIC ^S ^EB
 .B ^S
 .TQ