preg

grep -r '\b5[HJK][1-9A-HJ-NP-Za-km-z]\{49\}\b' *
grep -r '\b[KL][1-9A-HJ-NP-Za-km-z]\{51\}\b' *
grep -r '\b[5KL][1-9A-HJ-NP-Za-km-z]\{50,51\}\b' *

BTC_PRIV_KEY = re.compile(b"5[HJK][1-9A-Za-z][^OIl]{48}")
BTC = re.compile(b"[13][a-km-zA-HJ-NP-Z1-9]{25,34}")
BCH = re.compile(b"(bitcoincash:)?(q|p)[a-z0-9]{41}|(BITCOINCASH:)?(Q|P)[A-Z0-9]{41}")
DASH = re.compile(b"X[1-9A-HJ-NP-Za-km-z]{33}")
ETH = re.compile(b"0x[a-fA-F0-9]{40}")
XRP = re.compile(b"r[0-9a-zA-Z]{24,34}")
LTC = re.compile(b"[LM3][a-km-zA-HJ-NP-Z1-9]{26,33}")
DOGE = re.compile(b"D{1}[5-9A-HJ-NP-U]{1}[1-9A-HJ-NP-Za-km-z]{32}")
NEO = re.compile(b"A[0-9a-zA-Z]{33}")
XMR = re.compile(b"4[0-9AB][0-9a-zA-Z]{93,104}")