confirm only all upper or all lower case address are valid

baked_in.go

@@ -455,7 +455,7 @@ func isBitcoinAddress(fl FieldLevel) bool {
 func isBitcoinBech32Address(fl FieldLevel) bool {
 	address := fl.Field().String()
 
-	if !btcAddressRegexBech32.MatchString(address){
+	if !btcLowerAddressRegexBech32.MatchString(address) && !btcUpperAddressRegexBech32.MatchString(address){
 		return false
 	}
 

regexes.go

@@ -33,7 +33,8 @@ const (
 	hostnameRegexStringRFC952          = `^[a-zA-Z][a-zA-Z0-9\-\.]+[a-z-Az0-9]$`    // https://tools.ietf.org/html/rfc952
 	hostnameRegexStringRFC1123         = `^[a-zA-Z0-9][a-zA-Z0-9\-\.]+[a-z-Az0-9]$` // accepts hostname starting with a digit https://tools.ietf.org/html/rfc1123
 	btcAddressRegexString              = `^[13][a-km-zA-HJ-NP-Z1-9]{25,34}$`    // bitcoin address
-	btcAddressRegexStringBech32    = `^([bB][cC]1)[02-9ac-hj-np-zAC-HJ-NP-Z]{7,76}$`   // bitcoin bech32 address https://en.bitcoin.it/wiki/Bech32
+	btcAddressUpperRegexStringBech32   = `^BC1[02-9AC-HJ-NP-Z]{7,76}$`   // bitcoin bech32 address https://en.bitcoin.it/wiki/Bech32
+	btcAddressLowerRegexStringBech32   = `^bc1[02-9ac-hj-np-z]{7,76}$`   // bitcoin bech32 address https://en.bitcoin.it/wiki/Bech32
 	ethAddressRegexString              = `^0x[0-9a-fA-F]{40}$`
 	ethAddressUpperRegexString         = `^0x[0-9A-F]{40}$`
 	ethAddressLowerRegexString         = `^0x[0-9a-f]{40}$`
@@ -70,7 +71,8 @@ var (
 	hostnameRegexRFC952            = regexp.MustCompile(hostnameRegexStringRFC952)
 	hostnameRegexRFC1123           = regexp.MustCompile(hostnameRegexStringRFC1123)
 	btcAddressRegex                = regexp.MustCompile(btcAddressRegexString)
-	btcAddressRegexBech32    = regexp.MustCompile(btcAddressRegexStringBech32)
+	btcUpperAddressRegexBech32     = regexp.MustCompile(btcAddressUpperRegexStringBech32)
+	btcLowerAddressRegexBech32     = regexp.MustCompile(btcAddressLowerRegexStringBech32)
 	ethAddressRegex                = regexp.MustCompile(ethAddressRegexString)
 	ethaddressRegexUpper           = regexp.MustCompile(ethAddressUpperRegexString)
 	ethAddressRegexLower           = regexp.MustCompile(ethAddressLowerRegexString)

validator_test.go

@@ -4488,6 +4488,7 @@ func TestBitcoinBech32AddressValidation(t *testing.T){
 		{"BC13W508D6QEJXTDG4Y5R3ZARVARY0C5XW7KN40WF2", false},
 		{"bc1rw5uspcuh", false},
 		{"bc10w508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7kw5rljs90", false},
+		{"BC1QW508d6QEJxTDG4y5R3ZArVARY0C5XW7KV8F3T4", false},
 		{"BC1QR508D6QEJXTDG4Y5R3ZARVARYV98GJ9P", false},
 		{"bc10w508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7kw5rljs90", false},
 		{"bc1zw508d6qejxtdg4y5r3zarvaryvqyzf3du", false},