add the IP sanitize method

sanitize.go

@@ -1,11 +1,18 @@
 package sanitize
 
-// Integer returns only numbers
+import (
+	"net"
+	"regexp"
+)
+
+var reIP = regexp.MustCompile(`[^a-zA-Z0-9:.]`) // IPv4 and IPv6 characters only
+
+// Integer returns numbers only
 func Integer(input string) string {
 	runes := []rune{}
 	n := 0
 	for _, r := range input {
-		if !(r == 45) && !(r >= 48 && r <= 57) { // regexp.MustCompile(`[^-\d]`).ReplaceAllString(input, "$1")
+		if !(r == 45) && !(r >= 48 && r <= 57) { // Ignore any invalid characters first
 			continue
 		}
 		switch r {
@@ -30,7 +37,7 @@ func Float(input string) string {
 	dot := false
 	n := 0
 	for i, r := range input {
-		if !(r >= 44 && r <= 46) && !(r >= 48 && r <= 57) { // regexp.MustCompile(`[^-\.,\d]`).ReplaceAllString(input, "$1")
+		if !(r >= 44 && r <= 46) && !(r >= 48 && r <= 57) { // Ignore any invalid characters first
 			continue
 		}
 		switch r {
@@ -58,3 +65,12 @@ func Float(input string) string {
 	}
 	return ""
 }
+
+// IP returns the IP address in IPv4 or IPv6 format
+func IP(input string) string {
+	sanitized := reIP.ReplaceAllString(input, "")
+	if ip := net.ParseIP(sanitized); ip != nil {
+		return ip.String()
+	}
+	return ""
+}