Re: RegEx: find all occurances of a single character in a string

[Steven Bethard]

Franz Steinhaeusler wrote:
given a string:
st="abcdatraataza"
    ^   ^     ^ ^ (these should be found)
I want to get the positions of all single 'a' characters.
(Without another 'a' neighbour)
You could also try negative lookahead/lookbehind assertions:
>>> st="abcdatraataza"
>>> for m in re.finditer("(?<!a)a(?!a)", st):
...     print m.start()
...
0
4
10
12
Steve
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