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    <p>I ran this test before stumbling upon the discussion here. However, having run it I thought I'd at least post my results.</p> <p>I stole and bastardized the example in Jeff Friedl's "Mastering Regular Expressions". This is on a macbook running OSX 10.6 (2Ghz intel core 2 duo, 4GB ram). Python version is 2.6.1.</p> <p><strong>Run 1 - using re.compile</strong></p> <pre><code>import re import time import fpformat Regex1 = re.compile('^(a|b|c|d|e|f|g)+$') Regex2 = re.compile('^[a-g]+$') TimesToDo = 1000 TestString = "" for i in range(1000): TestString += "abababdedfg" StartTime = time.time() for i in range(TimesToDo): Regex1.search(TestString) Seconds = time.time() - StartTime print "Alternation takes " + fpformat.fix(Seconds,3) + " seconds" StartTime = time.time() for i in range(TimesToDo): Regex2.search(TestString) Seconds = time.time() - StartTime print "Character Class takes " + fpformat.fix(Seconds,3) + " seconds" Alternation takes 2.299 seconds Character Class takes 0.107 seconds </code></pre> <p><strong>Run 2 - Not using re.compile</strong></p> <pre><code>import re import time import fpformat TimesToDo = 1000 TestString = "" for i in range(1000): TestString += "abababdedfg" StartTime = time.time() for i in range(TimesToDo): re.search('^(a|b|c|d|e|f|g)+$',TestString) Seconds = time.time() - StartTime print "Alternation takes " + fpformat.fix(Seconds,3) + " seconds" StartTime = time.time() for i in range(TimesToDo): re.search('^[a-g]+$',TestString) Seconds = time.time() - StartTime print "Character Class takes " + fpformat.fix(Seconds,3) + " seconds" Alternation takes 2.508 seconds Character Class takes 0.109 seconds </code></pre>
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