Search substring in a string and get index of all occurances

[Nico Grubert]

Hi there,

I would like to search for a substring in a string and get the index of
all occurances.

mystring = 'John has a really nice powerbook.'
substr = ' ' # space

I would like to get this list:
[4, 8, 10, 17, 22]

How can I do that without using "for i in mystring" which might be
expensive for large strings?

Thanks in advance,
Nico

[Pierre Quentel]

mystring = 'John has a really nice powerbook.'
substr = ' ' # space

pos = 0
indices = []
while True:
i = mystring.find(substr,pos)
if i==-1:
break
indices.append(i)
pos = i+1
print indices

[4, 8, 10, 17, 22]

Pierre