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<html>
<head>
<title>Regular Expression Performance Comparison</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<meta name="Template" content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
</head>
<body bgcolor="#ffffff" link="#0000ff" vlink="#800080">
<h2>Regular Expression Performance Comparison</h2>
<p>The Boost and GRETA regular expression libraries have slightly different
interfaces, and it has been suggested that GRETA's interface allows for a more
efficient implementation. The following tables provide comparisons between:</p>
<p><a href="http://research.microsoft.com/projects/greta">GRETA</a>.</p>
<p><a href="http://www.boost.org/">The Boost regex library</a>.</p>
<p><a href="http://arglist.com/regex/">Henry Spencer's regular expression library</a>
- this is provided for comparison as a typical non-backtracking implementation.</p>
<p>
Times were obtained on a 2.8GHz Pentium&nbsp;4 PC running Windows XP, and the
code was compiled with Visual C++ 7.1 with all optimisations turned on. As ever
care should be taken in interpreting the results, only sensible regular
expressions (rather than pathological cases) are given, most are taken from the
Boost regex examples, or from the <a href="http://www.regxlib.com/">Library of
Regular Expressions</a>. In addition, some variation in the relative
performance of these libraries can be expected on other machines - as memory
access and processor caching effects can be quite large for most finite state
machine algorithms.</p>
<h3>Comparison 1: Long Search</h3>
<p>For each of the following regular expressions the time taken to find all
occurrences of the expression within a long English language text was measured
(<a href="ftp://ibiblio.org/pub/docs/books/gutenberg/etext02/mtent12.zip">mtent12.txt</a>
from <a href="http://promo.net/pg/">Project Gutenberg</a>, 19Mb).&nbsp;</p>
<P><table border="1" cellspacing="1">
<tr>
<td><strong>Expression</strong></td>
<td><strong>GRETA</strong></td>
<td><strong>GRETA<BR>
(non-recursive mode)</strong></td>
<td><strong>Boost</strong></td>
<td><strong>Boost + C++ locale</strong></td>
<td><strong>POSIX</strong></td>
<td><strong>PCRE</strong></td>
</tr>
<tr>
<td><code>Twain</code></td>
<td>9.29<BR>
(0.00309s)</td>
<td>32.9<BR>
(0.011s)</td>
<td>1.34<BR>
(0.000445s)</td>
<td>1.37<BR>
(0.000455s)</td>
<td>6.23<BR>
(0.00207s)</td>
<td><font color="#008000">1<BR>
(0.000333s)</font></td>
</tr>
<tr>
<td><code>Huck[[:alpha:]]+</code></td>
<td>12.9<BR>
(0.00309s)</td>
<td>44.4<BR>
(0.0106s)</td>
<td>1.79<BR>
(0.00043s)</td>
<td>1.82<BR>
(0.000436s)</td>
<td><font color="#008000">1<BR>
(0.00024s)</font></td>
<td><font color="#008000">1.06<BR>
(0.000254s)</font></td>
</tr>
<tr>
<td><code>[[:alpha:]]+ing</code></td>
<td>7.6<BR>
(0.0178s)</td>
<td>15.2<BR>
(0.0357s)</td>
<td><font color="#008000">1<BR>
(0.00235s)</font></td>
<td><font color="#008000">0.867<BR>
(0.00204s)</font></td>
<td>4.26<BR>
(0.01s)</td>
<td>6<BR>
(0.0141s)</td>
</tr>
<tr>
<td><code>^[^ ]*?Twain</code></td>
<td>5.92<BR>
(0.00626s)</td>
<td>16.3<BR>
(0.0172s)</td>
<td><font color="#008000">1<BR>
(0.00106s)</font></td>
<td><font color="#008000">0.666<BR>
(0.000704s)</font></td>
<td>NA</td>
<td>2.04<BR>
(0.00215s)</td>
</tr>
<tr>
<td><code>Tom|Sawyer|Huckleberry|Finn</code></td>
<td>8<BR>
(0.00828s)</td>
<td>20<BR>
(0.0207s)</td>
<td><font color="#008000">1<BR>
(0.00104s)</font></td>
<td><font color="#008000">0.585<BR>
(0.000605s)</font></td>
<td>42.3<BR>
(0.0438s)</td>
<td>1.12<BR>
(0.00115s)</td>
</tr>
<tr>
<td><code>(Tom|Sawyer|Huckleberry|Finn).{0,30}river|river.{0,30}(Tom|Sawyer|Huckleberry|Finn)</code></td>
<td>6.42<BR>
(0.012s)</td>
<td>16.3<BR>
(0.0307s)</td>
<td><font color="#008000">1<BR>
(0.00188s)</font></td>
<td><font color="#008000">0.719<BR>
(0.00135s)</font></td>
<td>NA</td>
<td>1.21<BR>
(0.00227s)</td>
</tr>
</table>
</P>
<h3>Comparison 2: Medium Sized Search</h3>
<p>For each of the following regular expressions the time taken to find all
occurrences of the expression within a medium sized English language text was
measured (the first 50K from mtent12.txt).&nbsp;</p>
<P><table border="1" cellspacing="1">
<tr>
<td><strong>Expression</strong></td>
<td><strong>GRETA</strong></td>
<td><strong>GRETA<BR>
(non-recursive mode)</strong></td>
<td><strong>Boost</strong></td>
<td><strong>Boost + C++ locale</strong></td>
<td><strong>POSIX</strong></td>
<td><strong>PCRE</strong></td>
</tr>
<tr>
<td><code>Twain</code></td>
<td>9.29<BR>
(0.00309s)</td>
<td>32.5<BR>
(0.0108s)</td>
<td>1.34<BR>
(0.000445s)</td>
<td>1.37<BR>
(0.000455s)</td>
<td>6.24<BR>
(0.00207s)</td>
<td><font color="#008000">1<BR>
(0.000333s)</font></td>
</tr>
<tr>
<td><code>Huck[[:alpha:]]+</code></td>
<td>12.9<BR>
(0.00309s)</td>
<td>47<BR>
(0.0113s)</td>
<td>1.77<BR>
(0.000425s)</td>
<td>1.84<BR>
(0.00044s)</td>
<td><font color="#008000">1<BR>
(0.00024s)</font></td>
<td><font color="#008000">1.04<BR>
(0.00025s)</font></td>
</tr>
<tr>
<td><code>[[:alpha:]]+ing</code></td>
<td>7.61<BR>
(0.0178s)</td>
<td>15.2<BR>
(0.0356s)</td>
<td><font color="#008000">1<BR>
(0.00234s)</font></td>
<td><font color="#008000">0.867<BR>
(0.00203s)</font></td>
<td>4.27<BR>
(0.01s)</td>
<td>5.94<BR>
(0.0139s)</td>
</tr>
<tr>
<td><code>^[^ ]*?Twain</code></td>
<td>5.72<BR>
(0.00626s)</td>
<td>15.5<BR>
(0.0169s)</td>
<td><font color="#008000">1<BR>
(0.00109s)</font></td>
<td><font color="#008000">0.644<BR>
(0.000704s)</font></td>
<td>NA</td>
<td>1.93<BR>
(0.00211s)</td>
</tr>
<tr>
<td><code>Tom|Sawyer|Huckleberry|Finn</code></td>
<td>7.85<BR>
(0.00828s)</td>
<td>19.9<BR>
(0.021s)</td>
<td><font color="#008000">1<BR>
(0.00105s)</font></td>
<td><font color="#008000">0.575<BR>
(0.000606s)</font></td>
<td>41.5<BR>
(0.0438s)</td>
<td><font color="#008000">1.09<BR>
(0.00115s)</font></td>
</tr>
<tr>
<td><code>(Tom|Sawyer|Huckleberry|Finn).{0,30}river|river.{0,30}(Tom|Sawyer|Huckleberry|Finn)</code></td>
<td>6.49<BR>
(0.012s)</td>
<td>16.5<BR>
(0.0307s)</td>
<td><font color="#008000">1<BR>
(0.00186s)</font></td>
<td><font color="#008000">0.737<BR>
(0.00137s)</font></td>
<td>216<BR>
(0.401s)</td>
<td>1.24<BR>
(0.00231s)</td>
</tr>
</table>
</P>
<H3>Comparison 3:&nbsp;C++ Code&nbsp;Search</H3>
<P>For each of the following regular expressions the time taken to find all
occurrences of the expression within the C++ source file <A href="../../../boost/crc.hpp">
boost/crc.hpp</A>&nbsp;was measured.&nbsp;</P>
<P><table border="1" cellspacing="1">
<tr>
<td><strong>Expression</strong></td>
<td><strong>GRETA</strong></td>
<td><strong>GRETA<BR>
(non-recursive mode)</strong></td>
<td><strong>Boost</strong></td>
<td><strong>Boost + C++ locale</strong></td>
<td><strong>POSIX</strong></td>
<td><strong>PCRE</strong></td>
</tr>
<tr>
<td><code>^(template[[:space:]]*&lt;[^;:{]+&gt;[[:space:]]*)?(class|struct)[[:space:]]*(\&lt;\w+\&gt;([
]*\([^)]*\))?[[:space:]]*)*(\&lt;\w*\&gt;)[[:space:]]*(&lt;[^;:{]+&gt;[[:space:]]*)?(\{|:[^;\{()]*\{)</code></td>
<td>9.58<BR>
(0.0019s)</td>
<td>40.3<BR>
(0.00798s)</td>
<td><font color="#008000">1<BR>
(0.000198s)</font></td>
<td><font color="#008000">0.901<BR>
(0.000178s)</font></td>
<td>607<BR>
(0.12s)</td>
<td>3.16<BR>
(0.000626s)</td>
</tr>
<tr>
<td><code>(^[
]*#(?:[^\\\n]|\\[^\n_[:punct:][:alnum:]]*[\n[:punct:][:word:]])*)|(//[^\n]*|/\*.*?\*/)|\&lt;([+-]?(?:(?:0x[[:xdigit:]]+)|(?:(?:[[:digit:]]*\.)?[[:digit:]]+(?:[eE][+-]?[[:digit:]]+)?))u?(?:(?:int(?:8|16|32|64))|L)?)\&gt;|('(?:[^\\']|\\.)*'|"(?:[^\\"]|\\.)*")|\&lt;(__asm|__cdecl|__declspec|__export|__far16|__fastcall|__fortran|__import|__pascal|__rtti|__stdcall|_asm|_cdecl|__except|_export|_far16|_fastcall|__finally|_fortran|_import|_pascal|_stdcall|__thread|__try|asm|auto|bool|break|case|catch|cdecl|char|class|const|const_cast|continue|default|delete|do|double|dynamic_cast|else|enum|explicit|extern|false|float|for|friend|goto|if|inline|int|long|mutable|namespace|new|operator|pascal|private|protected|public|register|reinterpret_cast|return|short|signed|sizeof|static|static_cast|struct|switch|template|this|throw|true|try|typedef|typeid|typename|union|unsigned|using|virtual|void|volatile|wchar_t|while)\&gt;</code></td>
<td><font color="#008000">1<BR>
(0.0116s)</font></td>
<td>2.7<BR>
(0.0313s)</td>
<td>1.22<BR>
(0.0141s)</td>
<td><font color="#008000">0.946<BR>
(0.011s)</font></td>
<td>NA</td>
<td>1.41<BR>
(0.0163s)</td>
</tr>
<tr>
<td><code>^[ ]*#[ ]*include[ ]+("[^"]+"|&lt;[^&gt;]+&gt;)</code></td>
<td>6.05<BR>
(0.00195s)</td>
<td>25.7<BR>
(0.0083s)</td>
<td><font color="#008000">1<BR>
(0.000323s)</font></td>
<td><font color="#008000">0.939<BR>
(0.000303s)</font></td>
<td>107<BR>
(0.0344s)</td>
<td>1.69<BR>
(0.000547s)</td>
</tr>
<tr>
<td><code>^[ ]*#[ ]*include[ ]+("boost/[^"]+"|<boost^[>]+&gt;)</code></td>
<td>5.8<BR>
(0.00196s)</td>
<td>24.6<BR>
(0.0083s)</td>
<td><font color="#008000">1<BR>
(0.000337s)</font></td>
<td><font color="#008000">1.07<BR>
(0.000362s)</font></td>
<td>122<BR>
(0.0413s)</td>
<td>1.59<BR>
(0.000538s)</td>
</tr>
</table>
</P>
<H3>
<H3>Comparison 4: HTML Document Search</H3>
</H3>
<P>For each of the following regular expressions the time taken to find all
occurrences of the expression within the html file <A href="../../libraries.htm">libs/libraries.htm</A>
was measured.&nbsp;</P>
<P><table border="1" cellspacing="1">
<tr>
<td><strong>Expression</strong></td>
<td><strong>GRETA</strong></td>
<td><strong>GRETA<BR>
(non-recursive mode)</strong></td>
<td><strong>Boost</strong></td>
<td><strong>Boost + C++ locale</strong></td>
<td><strong>POSIX</strong></td>
<td><strong>PCRE</strong></td>
</tr>
<tr>
<td><code>beman|john|dave</code></td>
<td>6.69<BR>
(0.00321s)</td>
<td>18.9<BR>
(0.00908s)</td>
<td><font color="#008000">1<BR>
(0.000479s)</font></td>
<td><font color="#008000">0.561<BR>
(0.000269s)</font></td>
<td>23.8<BR>
(0.0114s)</td>
<td><font color="#008000">1<BR>
(0.000479s)</font></td>
</tr>
<tr>
<td><code><p>.*?</p>
</code>
</td>
<td>5.89<BR>
(0.00164s)</td>
<td>19.6<BR>
(0.00548s)</td>
<td><font color="#008000">1<BR>
(0.000279s)</font></td>
<td><font color="#008000">1.05<BR>
(0.000293s)</font></td>
<td>NA</td>
<td>1.11<BR>
(0.000308s)</td>
</tr>
<tr>
<td><code><a^[>]+href=("[^"]*"|[^[:space:]]+)[^&gt;]*&gt;</code></td>
<td>3.94<BR>
(0.00219s)</td>
<td>10.4<BR>
(0.00579s)</td>
<td><font color="#008000">1.09<BR>
(0.000606s)</font></td>
<td><font color="#008000">0.825<BR>
(0.000459s)</font></td>
<td>221<BR>
(0.123s)</td>
<td><font color="#008000">1<BR>
(0.000557s)</font></td>
</tr>
<tr>
<td><code><h12345678][^[>]*&gt;.*?</h[12345678]></code></td>
<td>6.07<BR>
(0.0016s)</td>
<td>19.8<BR>
(0.00524s)</td>
<td>1.37<BR>
(0.000362s)</td>
<td><font color="#008000">0.722<BR>
(0.000191s)</font></td>
<td>NA</td>
<td><font color="#008000">1<BR>
(0.000264s)</font></td>
</tr>
<tr>
<td><code><img^[>]+src=("[^"]*"|[^[:space:]]+)[^&gt;]*&gt;</code></td>
<td>6.77<BR>
(0.00162s)</td>
<td>22.5<BR>
(0.0054s)</td>
<td>1.1<BR>
(0.000264s)</td>
<td>1.2<BR>
(0.000289s)</td>
<td>120<BR>
(0.0288s)</td>
<td><font color="#008000">1<BR>
(0.00024s)</font></td>
</tr>
<tr>
<td><code><font^[>]+face=("[^"]*"|[^[:space:]]+)[^&gt;]*&gt;.*?</font></code></td>
<td>6.77<BR>
(0.00162s)</td>
<td>22.5<BR>
(0.0054s)</td>
<td>1.12<BR>
(0.000269s)</td>
<td>1.2<BR>
(0.000289s)</td>
<td>NA</td>
<td><font color="#008000">1<BR>
(0.00024s)</font></td>
</tr>
</table>
</P>
<H3>Comparison 3: Simple Matches</H3>
<p>
For each of the following regular expressions the time taken to match against
the text indicated was measured.&nbsp;</p>
<P><table border="1" cellspacing="1">
<tr>
<td><strong>Expression</strong></td>
<td><strong>Text</strong></td>
<td><strong>GRETA</strong></td>
<td><strong>GRETA<BR>
(non-recursive mode)</strong></td>
<td><strong>Boost</strong></td>
<td><strong>Boost + C++ locale</strong></td>
<td><strong>POSIX</strong></td>
<td><strong>PCRE</strong></td>
</tr>
<tr>
<td><code>abc</code></td>
<td>abc</td>
<td>1.43<BR>
(2.25e-007s)</td>
<td>1.85<BR>
(2.91e-007s)</td>
<td>1.27<BR>
(2.01e-007s)</td>
<td>1.29<BR>
(2.03e-007s)</td>
<td>1.94<BR>
(3.06e-007s)</td>
<td><font color="#008000">1<BR>
(1.58e-007s)</font></td>
</tr>
<tr>
<td><code>^([0-9]+)(\-| |$)(.*)$</code></td>
<td>100- this is a line of ftp response which contains a message string</td>
<td><font color="#008000">1<BR>
(6.97e-007s)</font></td>
<td>2.69<BR>
(1.87e-006s)</td>
<td>1.89<BR>
(1.32e-006s)</td>
<td>1.86<BR>
(1.3e-006s)</td>
<td>298<BR>
(0.000208s)</td>
<td>1.29<BR>
(8.98e-007s)</td>
</tr>
<tr>
<td><code>([[:digit:]]{4}[- ]){3}[[:digit:]]{3,4}</code></td>
<td>1234-5678-1234-456</td>
<td>2.41<BR>
(2.14e-006s)</td>
<td>2.97<BR>
(2.64e-006s)</td>
<td>2.37<BR>
(2.1e-006s)</td>
<td>2.24<BR>
(1.99e-006s)</td>
<td>29.6<BR>
(2.63e-005s)</td>
<td><font color="#008000">1<BR>
(8.88e-007s)</font></td>
</tr>
<tr>
<td><code>^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$</code></td>
<td>john_maddock@compuserve.com</td>
<td>1.83<BR>
(3.7e-006s)</td>
<td>2.34<BR>
(4.74e-006s)</td>
<td>1.59<BR>
(3.21e-006s)</td>
<td>1.55<BR>
(3.13e-006s)</td>
<td>172<BR>
(0.000347s)</td>
<td><font color="#008000">1<BR>
(2.02e-006s)</font></td>
</tr>
<tr>
<td><code>^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$</code></td>
<td>foo12@foo.edu</td>
<td>1.71<BR>
(3.09e-006s)</td>
<td>2.19<BR>
(3.97e-006s)</td>
<td>1.71<BR>
(3.09e-006s)</td>
<td>1.64<BR>
(2.98e-006s)</td>
<td>123<BR>
(0.000222s)</td>
<td><font color="#008000">1<BR>
(1.81e-006s)</font></td>
</tr>
<tr>
<td><code>^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$</code></td>
<td>bob.smith@foo.tv</td>
<td>1.72<BR>
(3.09e-006s)</td>
<td>2.21<BR>
(3.97e-006s)</td>
<td>1.72<BR>
(3.09e-006s)</td>
<td>1.7<BR>
(3.06e-006s)</td>
<td>133<BR>
(0.00024s)</td>
<td><font color="#008000">1<BR>
(1.79e-006s)</font></td>
</tr>
<tr>
<td><code>^[a-zA-Z]{1,2}[0-9][0-9A-Za-z]{0,1} {0,1}[0-9][A-Za-z]{2}$</code></td>
<td>EH10 2QQ</td>
<td>1.29<BR>
(9.37e-007s)</td>
<td>1.71<BR>
(1.24e-006s)</td>
<td>1.29<BR>
(9.35e-007s)</td>
<td>1.18<BR>
(8.59e-007s)</td>
<td>7.79<BR>
(5.65e-006s)</td>
<td><font color="#008000">1<BR>
(7.26e-007s)</font></td>
</tr>
<tr>
<td><code>^[a-zA-Z]{1,2}[0-9][0-9A-Za-z]{0,1} {0,1}[0-9][A-Za-z]{2}$</code></td>
<td>G1 1AA</td>
<td>1.41<BR>
(9.26e-007s)</td>
<td>2<BR>
(1.32e-006s)</td>
<td>1.38<BR>
(9.07e-007s)</td>
<td>1.31<BR>
(8.6e-007s)</td>
<td>7.41<BR>
(4.88e-006s)</td>
<td><font color="#008000">1<BR>
(6.59e-007s)</font></td>
</tr>
<tr>
<td><code>^[a-zA-Z]{1,2}[0-9][0-9A-Za-z]{0,1} {0,1}[0-9][A-Za-z]{2}$</code></td>
<td>SW1 1ZZ</td>
<td>1.45<BR>
(9.54e-007s)</td>
<td>1.88<BR>
(1.24e-006s)</td>
<td>1.42<BR>
(9.36e-007s)</td>
<td>1.32<BR>
(8.69e-007s)</td>
<td>7.77<BR>
(5.12e-006s)</td>
<td><font color="#008000">1<BR>
(6.59e-007s)</font></td>
</tr>
<tr>
<td><code>^[[:digit:]]{1,2}/[[:digit:]]{1,2}/[[:digit:]]{4}$</code></td>
<td>4/1/2001</td>
<td>1.74<BR>
(1.01e-006s)</td>
<td>2.3<BR>
(1.34e-006s)</td>
<td>1.33<BR>
(7.73e-007s)</td>
<td>1.3<BR>
(7.54e-007s)</td>
<td>9.85<BR>
(5.73e-006s)</td>
<td><font color="#008000">1<BR>
(5.82e-007s)</font></td>
</tr>
<tr>
<td><code>^[[:digit:]]{1,2}/[[:digit:]]{1,2}/[[:digit:]]{4}$</code></td>
<td>12/12/2001</td>
<td>1.77<BR>
(1.01e-006s)</td>
<td>2.23<BR>
(1.28e-006s)</td>
<td>1.45<BR>
(8.31e-007s)</td>
<td>1.38<BR>
(7.93e-007s)</td>
<td>11.1<BR>
(6.34e-006s)</td>
<td><font color="#008000">1<BR>
(5.73e-007s)</font></td>
</tr>
<tr>
<td><code>^[-+]?[[:digit:]]*\.?[[:digit:]]*$</code></td>
<td>123</td>
<td>1.23<BR>
(7.65e-007s)</td>
<td>1.66<BR>
(1.03e-006s)</td>
<td>1.4<BR>
(8.69e-007s)</td>
<td>1.31<BR>
(8.12e-007s)</td>
<td>4.86<BR>
(3.02e-006s)</td>
<td><font color="#008000">1<BR>
(6.21e-007s)</font></td>
</tr>
<tr>
<td><code>^[-+]?[[:digit:]]*\.?[[:digit:]]*$</code></td>
<td>+3.14159</td>
<td>1.59<BR>
(1.05e-006s)</td>
<td>1.97<BR>
(1.3e-006s)</td>
<td>1.45<BR>
(9.54e-007s)</td>
<td>1.32<BR>
(8.69e-007s)</td>
<td>9.51<BR>
(6.26e-006s)</td>
<td><font color="#008000">1<BR>
(6.59e-007s)</font></td>
</tr>
<tr>
<td><code>^[-+]?[[:digit:]]*\.?[[:digit:]]*$</code></td>
<td>-3.14159</td>
<td>1.64<BR>
(1.07e-006s)</td>
<td>2<BR>
(1.3e-006s)</td>
<td>1.44<BR>
(9.35e-007s)</td>
<td>1.35<BR>
(8.78e-007s)</td>
<td>9.53<BR>
(6.19e-006s)</td>
<td><font color="#008000">1<BR>
(6.49e-007s)</font></td>
</tr>
</table>
</P>
<hr>
<p>Copyright John Maddock September 2002, all rights reserved.</p>
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