Merge pull request #27 from nullawhale/22_validate_ipv4

Feature Added - Validation an IPv4 Address

Author: patil-ashutosh

go.sum

@@ -0,0 +1,16 @@
+package rvalidation
+
+import (
+"fmt"
+"regexp"
+)
+
+// ValidateIPv4 validates a string as an ipv4 address.
+func ValidateIPv4(hash string) bool {
+class := `([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])`
+pattern := fmt.Sprintf(`^%[1]s\.%[1]s\.%[1]s\.%[1]s$`, class)
+reg := regexp.MustCompile(pattern)
+match := reg.MatchString(hash)
+
+return match
+}

regex/rvalidation/ipv4Validation.go

@@ -0,0 +1,45 @@
+package rvalidation_test
+
+import (
+"fmt"
+"testing"
+
+"github.com/patil-ashutosh/go-regex-utility/regex/rvalidation"
+)
+
+func TestValidateIPv4(t *testing.T) {
+type test struct {
+name string
+hash string
+expectedValidity bool
+}
+
+tests := []test{
+{name: "validIPv4_1", hash: "0.1.2.3", expectedValidity: true},
+{name: "validIPv4_2", hash: "172.16.1.2", expectedValidity: true},
+{name: "validIPv4_3", hash: "172.31.1.2", expectedValidity: true},
+{name: "validIPv4_4", hash: "192.167.1.2", expectedValidity: true},
+{name: "validIPv4_5", hash: "255.255.255.255", expectedValidity: true},
+{name: "InvalidIPv4_1", hash: "1.2.3.", expectedValidity: false},
+{name: "InvalidIPv4_2", hash: "1.2.256.4", expectedValidity: false},
+{name: "InvalidIPv4_3", hash: "1.256.3.4", expectedValidity: false},
+{name: "InvalidIPv4_4", hash: "1.2.3.4.5", expectedValidity: false},
+{name: "InvalidIPv4_5", hash: "1..3.4", expectedValidity: false},
+}
+
+for _, tc := range tests {
+tc := tc
+t.Run(tc.name, func(t *testing.T) {
+isValidHash := rvalidation.ValidateIPv4(tc.hash)
+if isValidHash != tc.expectedValidity {
+t.Errorf("ValidateIPv4(%v) Failed: expected %t, actual %t",
+tc.hash, tc.expectedValidity, isValidHash)
+}
+})
+}
+}
+
+func ExampleValidateIPv4() {
+fmt.Println(rvalidation.ValidateIPv4("192.168.1.2"))
+// Output: true
+}