- import re 
- subject = 'keyword1 keyword2 title:hello title:world "title:quoted" keyword3' 
- regex = re.compile(r'"[^"]*"|(\btitle:\S+)') 
- def myreplacement(m): 
-     if m.group(1): 
-         return "" 
-     else: 
-         return m.group(0) 
- replaced = regex.sub(myreplacement, subject) 
- print(replaced) 
-   
				aW1wb3J0IHJlCnN1YmplY3QgPSAna2V5d29yZDEga2V5d29yZDIgdGl0bGU6aGVsbG8gdGl0bGU6d29ybGQgInRpdGxlOnF1b3RlZCIga2V5d29yZDMnCnJlZ2V4ID0gcmUuY29tcGlsZShyJyJbXiJdKiJ8KFxidGl0bGU6XFMrKScpCmRlZiBteXJlcGxhY2VtZW50KG0pOgogICAgaWYgbS5ncm91cCgxKToKICAgICAgICByZXR1cm4gIiIKICAgIGVsc2U6CiAgICAgICAgcmV0dXJuIG0uZ3JvdXAoMCkKcmVwbGFjZWQgPSByZWdleC5zdWIobXlyZXBsYWNlbWVudCwgc3ViamVjdCkKcHJpbnQocmVwbGFjZWQpCg==