""" Purpose: consider string replace() functions
"""

# Get text, search string, and replacement string
text = input( "Enter text: " )
s = input( "Enter substring (s): " )   # this search is case sensitive... A =/= a
r = input( "Enter substring (r): " )     # if you just hit enter, the empty string "" will be stored in r
# replace() will only modify whitespace if you ask it to
# if there are no instances of s in text, nothing will chance
print()
# "" =/= " " the empty string is not the same as a space - there are empty strings between each character
# Get version of text with occurrences of s replaced with r
modified_text = text.replace( s, r ) # text is still the same, we have to capture that new string in
# modified_text in an assignment statement because strings are immutable

# Print substitution
print( "text.replace( s, r ):", modified_text, "   # text's s's replaced with r's" )
# how are we going to use the replace() function?
# parsing phone numbers, everyone stores phone numbers different ways with dashes,spaces,parentheses
# replace() can be really handy in cleaning up input
# to only replace part of a string, we can slice it and only operate on a substring
# if you want to replace multiple things, you need to use separate replace() statements... or look at regex
# regular expressions (regex) looks for patterns, so you can look for only numbers or something
# CS 3102 works with regex