import re
sentence = "open app store and maybe app marker here"
pattern = re.compile(r'\b(app)\s+(store|maker|market|etc)', re.I)
sentence = re.sub(pattern, r'\1\2', sentence)
print(sentence)
aW1wb3J0IHJlCnNlbnRlbmNlID0gIm9wZW4gYXBwIHN0b3JlIGFuZCBtYXliZSBhcHAgbWFya2VyIGhlcmUiCnBhdHRlcm4gPSByZS5jb21waWxlKHInXGIoYXBwKVxzKyhzdG9yZXxtYWtlcnxtYXJrZXR8ZXRjKScsIHJlLkkpCnNlbnRlbmNlID0gcmUuc3ViKHBhdHRlcm4sIHInXDFcMicsIHNlbnRlbmNlKQpwcmludChzZW50ZW5jZSk=