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tmngtk/gist:180927

Created September 4, 2009 14:46
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gistfile1.py
#
# my_replace("abcdefg", "bc", "ef")
# returns "ag"
#
# my_replace("abcdefg", "bc", "ef", "012")
# returns "a012g"
#
def my_replace(s, start, end, rep = ''):
buf = []
while s:
a = s.split(start, 1)
if len(a) == 1:
buf.append(a[0])
break
b = a[1].split(end, 1)
if len(b) == 1:
buf.append(b[0])
break
buf+= [buf.append(a[0]), rep, b[1]]
s = b[1]
return ''.join(buf)
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