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Mark Pilgrim
2009-08-05 20:19:32 -07:00
parent baf1ad3666
commit e25b8c0b1c
1 changed files with 7 additions and 7 deletions
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@@ -230,13 +230,13 @@ FAILED (errors=3)</samp></pre>
<p class=d>[<a href=examples/roman9.py>download <code>roman9.py</code></a>]
<pre class=pp><code>roman_numeral_pattern = re.compile('''
^ # beginning of string
<a> M{0,4} # thousands - 0 to 4 M's <span class=u>&#x2460;</span></a>
(CM|CD|D?C{0,3}) # hundreds - 900 (CM), 400 (CD), 0-300 (0 to 3 C's),
# or 500-800 (D, followed by 0 to 3 C's)
(XC|XL|L?X{0,3}) # tens - 90 (XC), 40 (XL), 0-30 (0 to 3 X's),
# or 50-80 (L, followed by 0 to 3 X's)
(IX|IV|V?I{0,3}) # ones - 9 (IX), 4 (IV), 0-3 (0 to 3 I's),
# or 5-8 (V, followed by 0 to 3 I's)
<a> M{0,4} # thousands - 0 to 4 Ms <span class=u>&#x2460;</span></a>
(CM|CD|D?C{0,3}) # hundreds - 900 (CM), 400 (CD), 0-300 (0 to 3 Cs),
# or 500-800 (D, followed by 0 to 3 Cs)
(XC|XL|L?X{0,3}) # tens - 90 (XC), 40 (XL), 0-30 (0 to 3 Xs),
# or 50-80 (L, followed by 0 to 3 Xs)
(IX|IV|V?I{0,3}) # ones - 9 (IX), 4 (IV), 0-3 (0 to 3 Is),
# or 5-8 (V, followed by 0 to 3 Is)
$ # end of string
''', re.VERBOSE)