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<HTML><TITLE>Regexp and Regsub</TITLE><BODY BGCOLOR="#FFF0E0" VLINK="#0FBD0F" TEXT="#101000" LINK="#0F0FDD">
<A NAME="top"><H1>Regexp and Regsub</H1>


<P><I> Online chapter from <A HREF="javascript:if(confirm('http://www.mapfree.com/sbf/tcl/book/home.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.mapfree.com/sbf/tcl/book/home.html'" tppabs="http://www.mapfree.com/sbf/tcl/book/home.html">Tcl/Tk for Programmers</A> (with exercises and solutions).</I>
<P>
 Much programming in Tcl involves handling data from users, files, or 
other
computer programs.  Often this data does not arrive in a form that is directly
usable.  The need to extract useful pieces from the whole is a major reason
for you to master regular expressions.  You will probably use them a lot.

<P> Using regular expressions and using them correctly are not the same thing.
It is not uncommon for a badly written regular expression to pass tests only
to fail in practice.  One of the goals of this chapter is to show you how you
can write them well.

<P>
<DL><DD>

<STRONG>7.1 <A HREF="7.1.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.1.html">Theory and Practice</A></STRONG><BR>

<STRONG>7.2 <A HREF="7.2.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.2.html">Character Set, Quoting, and Style</A></STRONG><BR>

<STRONG>7.3 <A HREF="7.3.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.3.html">Regular-Expression  versus Glob Patterns</A></STRONG><BR>

<STRONG>7.4 <A HREF="7.4.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.4.html">Repetitions and Branches</A></STRONG><BR>

<STRONG>7.5 <A HREF="7.5.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.5.html">Use Parentheses to Build more Complicated Patterns</A></STRONG><BR>

<STRONG>7.6 <A HREF="7.6.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.6.html">Use Parentheses to Extract Subpatterns</A></STRONG><BR>

<STRONG>7.7 <A HREF="7.7.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.7.html">Search and Replace</A></STRONG><BR>

<STRONG>7.8 <A HREF="7.8.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.8.html"><CITE>Style Review</CITE></A></STRONG><BR>

<STRONG>7.9 <A HREF="7.9.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/7.9.html">Solutions to Exercises</A></STRONG><BR>

</DL>


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<A HREF="copyright.html" tppabs="http://www.mapfree.com/sbf/tcl/book/select/Html/copyright.html">Notice</A>
<P>
<I>Jun 17, 1998</I>
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