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Mark Pilgrim
2009-09-11 15:40:31 -04:00
parent 7afedab6f8
commit 4b7c4a5431
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regular-expressions.html
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@@ -217,7 +217,7 @@ body{counter-reset:h1 5}
<a><samp class=p>>>> </samp><kbd class=pp>re.search(pattern, 'MCMLXXXX')</kbd> <span class=u>&#x2464;</span></a>
<samp class=p>>>> </samp></pre>
<ol>
<li>This matches the start of the string, then the first optional <code>M</code>, then <code>CM</code>, then <code>XL</code>, then the end of the string. Remember, the <code>(A|B|C)</code> syntax means &#8220;match exactly one of A, B, or C&#8221;. You match <code>XL</code>, so you ignore the <code>XC</code> and <code>L?X?X?X?</code> choices, and then move on to the end of the string. <code>MCML</code> is the Roman numeral representation of <code>1940</code>.
<li>This matches the start of the string, then the first optional <code>M</code>, then <code>CM</code>, then <code>XL</code>, then the end of the string. Remember, the <code>(A|B|C)</code> syntax means &#8220;match exactly one of A, B, or C&#8221;. You match <code>XL</code>, so you ignore the <code>XC</code> and <code>L?X?X?X?</code> choices, and then move on to the end of the string. <code>MCMXL</code> is the Roman numeral representation of <code>1940</code>.
<li>This matches the start of the string, then the first optional <code>M</code>, then <code>CM</code>, then <code>L?X?X?X?</code>. Of the <code>L?X?X?X?</code>, it matches the <code>L</code> and skips all three optional <code>X</code> characters. Then you move to the end of the string. <code>MCML</code> is the Roman numeral representation of <code>1950</code>.
<li>This matches the start of the string, then the first optional <code>M</code>, then <code>CM</code>, then the optional <code>L</code> and the first optional <code>X</code>, skips the second and third optional <code>X</code>, then the end of the string. <code>MCMLX</code> is the Roman numeral representation of <code>1960</code>.
<li>This matches the start of the string, then the first optional <code>M</code>, then <code>CM</code>, then the optional <code>L</code> and all three optional <code>X</code> characters, then the end of the string. <code>MCMLXXX</code> is the Roman numeral representation of <code>1980</code>.