[EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
import re
s='abcdatraataza'
r=re.compile('(?<!a)a(?!a)')
a_list=[ match.start() for match in re2.finditer(s) ]
Oops, tested this time:
----------------------------
import re
def index_letters(s,l):
regexp='(?<!%s)%s(?!%s)' % (l,l,l)
r=re.compile(regexp)
return [ match.start() for match in r.finditer(s) ]
print index_letters('abcdatraataza','a')
Just comparing Fredrik Lundh's method:
r=re.compile("a+")
[m.start() for m in r.finditer(s) if len(m.group()) == 1]
Mine runs 100K iterations of 'abcdatraataza','a' in 1.4s
whereas Fredrik's does the same in 1.9s
--
Pádraig Brady - http://www.pixelbeat.org
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