programming-examples/python/Regular_Expression/Find the occurrence and position of the substrings within a string.py

import re  
text = 'Python exercises, PHP exercises, C# exercises'  
pattern = 'exercises'  
for match in re.finditer(pattern, text):  
    s = match.start()  
    e = match.end()  
    print('Found "%s" at %d:%d' % (text[s:e], s, e))