[Bug cli/27175] New: Incorrect skip command example presented in the manual

[Bug cli/27175] New: Incorrect skip command example presented in the manual

[kimi.h.kuparinen at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27175

            Bug ID: 27175
           Summary: Incorrect skip command example presented in the manual
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: kimi.h.kuparinen at gmail dot com
  Target Milestone: ---

Trying to run examples in the manual such as:

skip -rfu ^std::(allocator|basic_string)<.*>::~?\1 *\(

from chapter 5.3 errors out with `Invalid argument: *(`, and trying to quote
the regex:

skip -rfu 'std::(allocator|basic_string)<.*>::~?\1 *\('

errors out with `regexp: Unmatched ( or \(`. To get an a working regex
expression you have to escape the backslashes inside the quotes:

skip -rfu 'std::(allocator|basic_string)<.*>::~?\\1 *\\('

As far as I can tell, all commands that utilise gdb_argv for parsing commands
suffer from the same issue, because buildargv() in libiberty/argv.c escapes all
backslashes it finds, quoted or not.

Preferably the user shouldn't have to escape backslashes inside a quoted
expression, but it should at least be mentioned in the manual.

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