regex - How to search for alphanumeric substring of specific length in Python? -


say have string "ldhjshjds hdajhdshj4 hdsshj4 kdskjdshjdsjds"

i want search substrings (alphanumeric only) starting "h", if string between 10-20 characters.

"hdajhdshj4" match. "hdsshj4" not.

would such regex costly on cpu cycles?

r"\bh[a-za-z0-9]{9,19}\b" looks precisely that.


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