#  SplittingAtoms.py  Copyright (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-05-24  File created.
#  2022-12-16  Converted to Python 3.

#  This program demonstrates how simple regular expressions can
#  be used to split strings.


import re  #  regular expressions module

atomic_text  =  "\n Atoms consist of protons, neutrons, and electrons."

print( atomic_text )

#  Split the atomic text in positions that contain a newline or a comma.

substrings_from_text  =   re.split( "[\n,]", atomic_text )

for substring_index  in  range( len( substrings_from_text ) ) :

   print( "\n %d:%s"  %  ( substring_index,
                       substrings_from_text[ substring_index ] ), end="" )


#  The following statement rejoins the strings from the list referenced
#  by substrings_from_text.  After this the string will be resplit.

atomic_text  =  "".join( substrings_from_text )

print( "\n\n"  +  atomic_text )

#  Split the atomic text in positions that contain a space character.

substrings_from_text  =  re.split( "[ ]", atomic_text )

for substring_index  in  range( len( substrings_from_text ) ) :

   print( "\n %d:%s"  %  ( substring_index,
                       substrings_from_text[ substring_index ] ), end="" )

print( "\n" )