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x
 
import re
txt = "The rain in Spain"
#Check if "ain" is present, but NOT at the beginning of a word:
x = re.findall(r"\Bain", txt)
print(x)
if x:
  print("Yes, there is at least one match!")
else:
  print("No match")
['ain', 'ain']
Yes, there is at least one match!