Hola,
fácil:
Código Python:
Ver originalPalabras = ["hola1", "hola2", "J00hola3", "hola4", "J00hola5", "hola6", "hola7", "J00hola8", "J00hola9"]
for Palabra in Palabras:
if (Palabra[0:3] == "J00"):
print("Existe \"J00\" en la palabra: %s" % Palabra)
raw_input()
Suerte!!