Ajith Gopinath wrote:
>  Hi,
> 
>  How to find out all the occuerence of a particular pattern like  in a 
>  long text where a capital letter in between two small letters 
>  ('aBa','dAd' etc..)

The other proposals are all good. However if performance is a concern 
then I'd use string.maketran to create a translation table, then apply 
it to the text using translate, such that all lower case letters are 
translated to 'l', all upper case letters to 'u', then look for 'lul'.

import string
translationTable = string.maketrans(string.ascii_uppercase + 
string.ascii_lowercase, 'u'*26 + 'l'*26)
translatedText = text.translate(translationTable)
start = 0
while True:
  start = translatedText.find('lul', start)
  if start > = 0:
    print text[start:start+3]
  else:
    break

Translate and find are both very fast.

-- 
Bob Gailer
Chapel Hill NC
919-636-4239
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