Buscar y reemplazar
Expresiones regulares en Python
Maria Eugenia Inzaugarat
Data scientist
Buscar subcadenas
- Busca en el string una subcadena dada.
my_string = "Where's Waldo?"
my_string.find("Waldo")
8
my_string.find("Wenda")
-1
Buscar subcadenas
- Busca en el string una subcadena dada.
my_string = "Where's Waldo?"
my_string.find("Waldo", 0, 6)
-1
Función index
- Igual que
.find(), busca una subcadena dada.
my_string = "Where's Waldo?"
my_string.index("Waldo")
8
my_string.index("Wenda")
File "<stdin>", line 1, in <module>
ValueError: substring not found
Función index
- Igual que
.find(), busca una subcadena dada.
my_string = "Where's Waldo?"
try:
my_string.index("Wenda")
except ValueError:
print("Not found")
"Not found"
Contar apariciones
- Devuelve cuántas veces aparece una subcadena dada.
my_string = "How many fruits do you have in your fruit basket?"
my_string.count("fruit")
2
my_string.count("fruit", 0, 16)
1
Reemplazar subcadenas
- Reemplaza apariciones de una subcadena por otra.
my_string = "The red house is between the blue house and the old house"
print(my_string.replace("house", "car"))
The red car is between the blue car and the old car
print(my_string.replace("house", "car", 2))
The red car is between the blue car and the old house
