[Bug testsuite/33551] [gdb/testsuite] Formalize regexp style

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33551

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Created attachment 16427
  --> https://sourceware.org/bugzilla/attachment.cgi?id=16427&action=edit
quotemeta patch

Here's an implementation of quotemeta in Tcl.

To see how it looks, this rust test from simple.exp:

gdb_test "print a" " = \\(\\)"

Can be rewritten

gdb_test "print a" [quotemeta "$@DECIMAL = ()"]

Note that the new test is "better" in that it matches the
history variable as well, something typically left out
because it's a pain to quote.

Offhand I don't recall what predefines are used in AdaCore
(can't look until later) but this patch includes a few that
I know are in there and that are obviously handy.

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