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x
 
import re
txt = "The rain in Spain"
#Return a match at every NON white-space character:
x = re.findall("\S", txt)
print(x)
if x:
  print("Yes, there is at least one match!")
else:
  print("No match")

['T', 'h', 'e', 'r', 'a', 'i', 'n', 'i', 'n', 'S', 'p', 'a', 'i', 'n']
Yes, there is at least one match!