compiling_regexes.py

# Somewhere at start

# for instance,
if __name__ == "__main__"
   self.regex = re.compile(row['keywords'],re.I|re.M)         
   self.matches = re.finditer(regex, x)

# Later on...
def get_iso2(x, regex, matches): 
 
    iso2={}
    for j in ....
        for m in matches:
            iso2[row['iso2']] = iso2.get(row['iso2'], 0) + 1
            
    return [key for key, value in iso2.items() for _ in range(value)]