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<h1>REGEX AND SHELL QUOTING</h1>
<p>When entering a regular expression argument in the shell
command line it is often necessary to use quoting (enclosing
the argument in <code><b>" "</b></code> or
<code><b>' '</b></code>) in order to prevent the shell
from interpreting certain characters, for example, spaces as
argument separators and <code><b>$</b></code> as variable
expansions.</p>
<p>Unfortunately it is hard to achieve this in a manner that is
portable across POSIX shells, such as those found on
GNU/Linux and UNIX, and Windows shell. For example, if you
use <code><b>" "</b></code> for quoting you will get a
wrong result with POSIX shells if your expression contains
<code><b>$</b></code>. The standard way of dealing with this
on POSIX systems is to use <code><b>' '</b></code> instead.
Unfortunately, Windows shell does not remove <code><b>' '</b></code>
from arguments when they are passed to applications. As a result you
may have to use <code><b>' '</b></code> for POSIX and
<code><b>" "</b></code> for Windows (<code><b>$</b></code> is
not treated as a special character on Windows).</p>
<p>Alternatively, you can save regular expression options into
a file, one option per line, and use this file with the
<code><b>--options-file</b></code> option. With this approach
you don't need to worry about shell quoting.</p>
<h1>DIAGNOSTICS</h1>
<p>If the input file is not valid C++, <code><b>odb</b></code>
will issue diagnostic messages to STDERR and exit with non-zero exit
code.</p>
<h1>BUGS</h1>
<p>Send bug reports to the
<a href="mailto:odb-users@codesynthesis.com">odb-users@codesynthesis.com</a> mailing list.</p>
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