如何在正则表达式模式中插入变量？

Question

我有一份清单：

cpt=0
list=["dermato","bioderma", "gatoderma"]
for l in list:
 if re.findall(".*derma.*",l):
     cpt=cpt+1

因此，与其直接将“derma”作为正则表达式，我希望：

a= "derma"   #initialize
list=["dermato","bioderma", "gatoderma"]
for l in list:
if re.findall(".*a.*",l):
     cpt=cpt+1

Answer 1

您可以使用f字串：

a=  "derma"
list = ["dermato","bioderma", "gatoderma"]
for l in list:
if re.findall(f".*{a}.*", l):
     cpt += 1