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Bitcoin (BTC) Address Regex
Validates Bitcoin Legacy (P2PKH starting with 1), SegWit P2SH (starting with 3), and Native SegWit (Bech32 starting with bc1) wallet addresses.
Regular Expression Pattern:
/^(?:1[a-km-zA-HJ-NP-Z1-9]{25,34}|3[a-km-zA-HJ-NP-Z1-9]{25,34}|bc1[a-zA-HJ-NP-Z0-9]{25,39})$/
Valid Match Example:
bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq
Invalid / Non-Match Example:
0x71C8451C3343244F00806440
Regex Syntax Breakdown & Explanation
- •1[...] : Base58Check P2PKH address
- •3[...] : Base58Check script hash P2SH address
- •bc1[...] : Native Bech32 SegWit format
Implementation in Popular Languages
JavaScript / TypeScript
const regex = /^(?:1[a-km-zA-HJ-NP-Z1-9]{25,34}|3[a-km-zA-HJ-NP-Z1-9]{25,34}|bc1[a-zA-HJ-NP-Z0-9]{25,39})$/;
const isValid = regex.test("bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq");
console.log(isValid); // truePython (re)
import re
pattern = r"^(?:1[a-km-zA-HJ-NP-Z1-9]{25,34}|3[a-km-zA-HJ-NP-Z1-9]{25,34}|bc1[a-zA-HJ-NP-Z0-9]{25,39})$"
match = re.match(pattern, "bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq")
print(bool(match)) # TrueGo (regexp)
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`^(?:1[a-km-zA-HJ-NP-Z1-9]{25,34}|3[a-km-zA-HJ-NP-Z1-9]{25,34}|bc1[a-zA-HJ-NP-Z0-9]{25,39})$`)
fmt.Println(re.MatchString("bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq"))
}Frequently Asked Questions
Frequently Asked Questions
Everything you need to know regarding specifications, syntax, and security best practices.
The regular expression pattern is /^(?:1[a-km-zA-HJ-NP-Z1-9]{25,34}|3[a-km-zA-HJ-NP-Z1-9]{25,34}|bc1[a-zA-HJ-NP-Z0-9]{25,39})$/. Validates Bitcoin Legacy (P2PKH starting with 1), SegWit P2SH (starting with 3), and Native SegWit (Bech32 starting with bc1) wallet addresses.