Hello Roger, > I'm looking for a regular expression that matches the first, and only > the first, sequence of the letter 'a', and only if the length of the > sequence is exactly 3.
import sys, re, os
if __name__=='__main__':
m = re.search('a{3}', 'xyz123aaabbaaabbbbababbbbaabb')
print m.group(0)
print "Preceded by: \"" + m.string[0:m.start(0)] + "\""
Best wishes,
Christoph
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