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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Boost.Regex: Sed-Style Format String Syntax</title>
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<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../boost.png" border="0"></a></h3>
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<TD width="353">
<H1 align="center">Boost.Regex</H1>
<H2 align="center">Sed-Style Format String Syntax</H2>
</TD>
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<h3><a href="index.html"><img height="45" width="43" alt="Boost.Regex Index" src="uarrow.gif" border="0"></a></h3>
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<P>Sed-style format strings treat all characters as literals except:</P>
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<TD>&</TD>
<TD>The ampersand character is replaced in the output stream by the the whole of
what matched the regular expression. Use \& to output a literal
'&' character.</TD>
</TR>
<TR>
<TD>\</TD>
<TD>Specifies an escape sequence.</TD>
</TR>
</TABLE>
</P>
<P>
<P>An escape character followed by any character <EM>x</EM>, outputs that
character unless <EM>x</EM> is one of the escape sequences shown below.</P>
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<TD><STRONG>Escape</STRONG></TD>
<TD><STRONG>Meaning</STRONG></TD>
</TR>
<TR>
<TD>\a</TD>
<TD>Outputs the bell character: '\a'.</TD>
</TR>
<TR>
<TD>\e</TD>
<TD>Outputs the ANSI escape character (code point 27).</TD>
</TR>
<TR>
<TD>\f</TD>
<TD>Outputs a form feed character: '\f'</TD>
</TR>
<TR>
<TD>\n</TD>
<TD>Outputs a newline character: '\n'.</TD>
</TR>
<TR>
<TD>\r</TD>
<TD>Outputs a carriage return character: '\r'.</TD>
</TR>
<TR>
<TD>\t</TD>
<TD>Outputs a tab character: '\t'.</TD>
</TR>
<TR>
<TD>\v</TD>
<TD>Outputs a vertical tab character: '\v'.</TD>
</TR>
<TR>
<TD>\xDD</TD>
<TD>Outputs the character whose hexadecimal code point is 0xDD</TD>
</TR>
<TR>
<TD>\x{DDDD}</TD>
<TD>Outputs the character whose hexadecimal code point is 0xDDDDD</TD>
</TR>
<TR>
<TD>\cX</TD>
<TD>Outputs the ANSI escape sequence "escape-X".</TD>
</TR>
<TR>
<TD>\D</TD>
<TD>If <EM>D</EM> is a decimal digit in the range 1-9, then outputs the text that
matched sub-expression <EM>D</EM>.</TD>
</TR>
</TABLE>
</P>
<P>
<HR>
</P>
<P></P>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
24 Nov 2004
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
<p><i> Copyright John Maddock 2004</i></p>
<P><I>Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>)</I></P>
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