📄 13-grep.mht
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<TR vAlign=3Dtop>
<TD>
<P class=3DCellBody><A name=3DpgfId-1001742></A><SPAN=20
class=3DBold>[a-c][d-e]</SPAN> </P></TD>
<TD>
<P class=3DCellBody><A name=3DpgfId-1001744></A>matches <SPAN=20
class=3DBold>ad</SPAN>, <SPAN class=3DBold>bd</SPAN>, <SPAN=20
class=3DBold>ae</SPAN>, or <SPAN class=3DBold>be</SPAN>=20
</P></TD></TR></TBODY></TABLE>
<P class=3DBody><A name=3DpgfId-1001745></A>The backreference <SPAN=20
class=3DBold>\n</SPAN>, where <SPAN class=3DBold>n</SPAN> is a single =
digit, matches=20
the substring previously matched by the nth parenthesized subexpression =
of the=20
regular expression. For example, <SPAN class=3DBold>\(ab)c\1</SPAN> =
matches <SPAN=20
class=3DBold>abbbcabbb</SPAN>, but not <SPAN =
class=3DBold>abbbcabb</SPAN>.</P>
<P class=3DBody><A name=3DpgfId-1001746></A>For additional information =
on regular=20
expressions, please refer to a reference text such as <STRONG=20
class=3DBoldEmphasis>Mastering Regular Expressions</EM><SUP><A =
class=3Dfootnote=20
href=3D"http://sourcenav.sourceforge.net/online-docs/userguide/grep.html#=
footnote2">2</SUP></A>.</P>
<P class=3DBody><A name=3DpgfId-998197></A></P>
<HR>
<DIV class=3Dfootnotes>
<DIV class=3Dfootnote>
<P class=3DFootnote><SPAN class=3DfootnoteNumber>1.</SPAN> <A=20
name=3DpgfId-998265></A>Richard Stallman and Karl Berry wrote the GNU =
regex=20
backtracking matcher. Copyright =A9 1989, 1991 Free Software Foundation, =
Inc., 675=20
Massachusetts Avenue, Cambridge, MA 02139, USA. <A=20
href=3D"http://sourcenav.sourceforge.net/online-docs/userguide/grep.html#=
fn1">Return=20
to text</A></P>
<P class=3DFootnote><SPAN class=3DfootnoteNumber>2.</SPAN> <A=20
name=3Dfootnote2></A>Friedl, Jeffrey E. F. 1997. <STRONG=20
class=3DBoldEmphasisFootnote>Mastering Regular Expressions</STRONG>. =
ISBN=20
1-56592-257-3.</P></DIV></DIV>
<HR align=3Dcenter>
<TABLE class=3DTABLE cellPadding=3D1 width=3D100 align=3Dcenter =
border=3D0>
<TBODY>
<TR>
<TD align=3Dmiddle>
<P class=3DGotos><A=20
=
href=3D"http://sourcenav.sourceforge.net/online-docs/userguide/index_ug.h=
tml">Contents</A>=20
</P></TD>
<TD align=3Dmiddle>
<P class=3DGotos><A=20
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href=3D"http://sourcenav.sourceforge.net/online-docs/userguide/retrvr.htm=
l">Previous</A></P></TD>
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<P class=3DGotos><A=20
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