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Regular Expression
r"
(?<!\d)\d{4}(?!\d)
"
gm
Input 1
New
Film_relase_date:1970_films_by_20th_Century_Fox Film_relase_date:19720_films_by_20th_Century_Fox Film_relase_date:197_films_by_20th_Century_Fox test1test1234test1234567890testa1a2a3a4444a55555a0000000000000000000000000000000000000000
Extraction
Film_relase_date:1970_films_by_20th_Century_Fox Film_relase_date:19720_films_by_20th_Century_Fox Film_relase_date:197_films_by_20th_Century_Fox test1test1234test1234567890testa1a2a3a4444a55555a0000000000000000000000000000000000000000