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3      <title>Regular Expression Performance Comparison</title>
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10      <h2>Regular Expression Performance Comparison</h2>
11      <p>
12         The following tables provide comparisons between the following regular
13         expression libraries:</p>
14      <p><a href="http://research.microsoft.com/projects/greta">GRETA</a>.</p>
15      <p><a href="http://www.boost.org/">The Boost regex library</a>.</p>
16      <p><a href="http://arglist.com/regex/">Henry Spencer's regular expression library</a>
17         - this is provided for comparison as a typical non-backtracking implementation.</p>
18      <P>Philip Hazel's <A href="http://www.pcre.org">PCRE</A> library.</P>
19      <H3>Details</H3>
20      <P>Machine: Intel Pentium 4 2.8GHz PC.</P>
21      <P>Compiler: %compiler%.</P>
22      <P>C++ Standard Library: %library%.</P>
23      <P>OS: %os%.</P>
24      <P>Boost version: %boost%.</P>
25      <P>PCRE version: %pcre%.</P>
26      <P>
27         As ever care should be taken in interpreting the results, only sensible regular
28         expressions (rather than pathological cases) are given, most are taken from the
29         Boost regex examples, or from the <a href="http://www.regxlib.com/">Library of
30            Regular Expressions</a>. In addition, some variation in the relative
31         performance of these libraries can be expected on other machines - as memory
32         access and processor caching effects can be quite large for most finite state
33         machine algorithms.</P>
34      <H3>Averages</H3>
35      <P>The following are the average relative scores for all the tests: the perfect
36         regular expression library&nbsp;would score 1, in practice anything less than 2
37         is pretty good.</P>
38      <P>%averages%</P>
39      <h3>Comparison 1: Long Search</h3>
40      <p>For each of the following regular expressions the time taken to find all
41         occurrences of the expression within a long English language text was measured
42         (<a href="http://www.gutenberg.org/files/3200/old/mtent12.zip">mtent12.txt</a>
43         from <a href="http://promo.net/pg/">Project Gutenberg</a>, 19Mb).&nbsp;</p>
44      <P>%long_twain_search%</P>
45      <h3>Comparison 2: Medium Sized Search</h3>
46      <p>For each of the following regular expressions the time taken to find all
47         occurrences of the expression within a medium sized English language text was
48         measured (the first 50K from mtent12.txt).&nbsp;</p>
49      <P>%short_twain_search%</P>
50      <H3>Comparison 3:&nbsp;C++ Code&nbsp;Search</H3>
51      <P>For each of the following regular expressions the time taken to find all
52         occurrences of the expression within the C++ source file <A href="../../../boost/crc.hpp">
53            boost/crc.hpp</A>&nbsp;was measured.&nbsp;</P>
54      <P>%code_search%</P>
55      <H3>
56         <H3>Comparison 4: HTML Document Search</H3>
57      </H3>
58      <P>For each of the following regular expressions the time taken to find all
59         occurrences of the expression within the html file <A href="../../libraries.htm">libs/libraries.htm</A>
60         was measured.&nbsp;</P>
61      <P>%html_search%</P>
62      <H3>Comparison 3: Simple Matches</H3>
63      <p>
64         For each of the following regular expressions the time taken to match against
65         the text indicated was measured.&nbsp;</p>
66      <P>%short_matches%</P>
67      <hr>
68      <p><i>© Copyright John Maddock&nbsp;2003</i></p>
69      <p><i>Use, modification and distribution are subject to the Boost Software License,
70            Version 1.0. (See accompanying file <a href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
71            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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