How to insert a variable in a regex pattern?

Question

i have a list :

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

So, instead of putting directly 'derma' as regex , i want :

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

The regex still has to be compiled, doesn't matter where you put the string. You would like to save time, but it doesn't matter how it's done takes the same time. — , Oct 30 '20 at 21:48

ruohola · Accepted Answer · 2020-10-31T09:57:06.250

-2

You can use an f-string:

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

edited Oct 31 '20 at 09:57

answered Oct 30 '20 at 21:33

ruohola

1 Answers1