diff --git a/.gitignore b/.gitignore
index 35620a1..200554a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,6 @@
 
 # Dependency directories
 vendor
+
+# IDE Files
+.idea/
diff --git a/str/str.go b/str/str.go
index fcdb32c..856a124 100644
--- a/str/str.go
+++ b/str/str.go
@@ -1,6 +1,10 @@
 package str
 
-import "unicode"
+import (
+	"regexp"
+	"strings"
+	"unicode"
+)
 
 func UpperFirst(input string) string {
 	if len(input) == 0 {
@@ -19,3 +23,217 @@ func InSlice(input interface{}, expects ...interface{}) bool {
 	}
 	return false
 }
+
+// Return the remainder of a string after the first occurrence of a given value.
+func After(subject string, search string) string {
+	if len(search) == 0 {
+		return subject
+	}
+	results := strings.SplitN(subject, search, 2)
+	return results[len(results)-1]
+}
+
+// Return the remainder of a string after the last occurrence of a given value.
+func AfterLast(subject string, search string) string {
+	if len(search) == 0 {
+		return subject
+	}
+	position := strings.LastIndex(subject, search)
+
+	if position == -1 {
+		return subject
+	}
+
+	return subject[position+len(search):]
+}
+
+// Get the portion of a string before the first occurrence of a given value.
+func Before(subject string, search string) string {
+	if len(search) == 0 {
+		return subject
+	}
+	position := strings.Index(subject, search)
+
+	if position == -1 {
+		return subject
+	}
+
+	return subject[:position]
+}
+
+func BeforeLast(subject string, search string) string {
+	if len(search) == 0 {
+		return subject
+	}
+	position := strings.LastIndex(subject, search)
+
+	if position == -1 {
+		return subject
+	}
+
+	return subject[:position]
+}
+
+func Between(subject string, from string, to string) string {
+	if len(from) == 0 || len(to) == 0 {
+		return subject
+	}
+
+	return BeforeLast(After(subject, from), to)
+}
+
+func Contains(haystack string, needle string) bool {
+	if len(needle) == 0 {
+		return false
+	}
+
+	return strings.Contains(haystack, needle)
+}
+
+func ContainsFromSlice(haystack string, needles []string) bool {
+	if len(needles) == 0 {
+		return false
+	}
+
+	for _, needle := range needles {
+		if Contains(haystack, needle){
+			return true
+		}
+	}
+
+	return false
+}
+
+func ContainsAllFromSlice(haystack string, needles []string) bool {
+	if len(needles) == 0 {
+		return false
+	}
+
+	for _, needle := range needles {
+		if !Contains(haystack, needle){
+			return false
+		}
+	}
+
+	return true
+}
+
+func EndsWith(haystack string, needle string) bool {
+	if len(needle) == 0 {
+		return false
+	}
+
+	return strings.HasSuffix(haystack, needle)
+}
+
+func StartsWith(haystack string, needle string) bool {
+	if len(needle) == 0 {
+		return false
+	}
+
+	return strings.HasPrefix(haystack, needle)
+}
+
+func Lower(value string) string {
+	return strings.ToLower(value)
+}
+
+func Upper(value string) string {
+	return strings.ToUpper(value)
+}
+
+func Finish(value string, cap string) string {
+	quoted := regexp.QuoteMeta(cap)
+
+	re := regexp.MustCompile("(?:"+ quoted +")+$")
+	return re.ReplaceAllString(value, "") + cap
+}
+
+func Start(value string, prefix string) string {
+	quoted := regexp.QuoteMeta(prefix)
+
+	re := regexp.MustCompile("^(?:"+ quoted +")+")
+	return prefix + re.ReplaceAllString(value, "")
+}
+
+//
+//func Title(value string) string {
+//  // TODO
+//	return ""
+//}
+//
+// func Kebab(vale string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func Length(value string) int {
+// 	// TODO
+// 	return 0
+// }
+//
+// func LimitCharacters(value string, limit int, end string) string{
+// 	// TODO
+// 	return ""
+// }
+//
+// func LimitWords(value string, limit int, end string) string{
+// 	// TODO
+// 	return ""
+// }
+//
+// func PadBoth(value string, length int, pad string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func PadLeft(value string, length int, pad string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func PadRight(value string, length int, pad string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func ReplaceArray(search string, replace []string, subject string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func ReplaceFirst(search string, replace string, subject string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func ReplaceLast(search string, replace string, subject string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func Slug(value string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func SlugWithDelimiter(value string, delimiter string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func Snake(value string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func Studly(value string) string {
+// 	// TODO
+// 	return ""
+// }
+//
+// func UcFirst(value string) string {
+// 	// TODO
+// 	return ""
+// }
+//
diff --git a/test/str_test.go b/test/str_test.go
index c5719c3..3780880 100644
--- a/test/str_test.go
+++ b/test/str_test.go
@@ -35,3 +35,159 @@ func Test_in_slice_with_multiple_one_matched_parameters(t *testing.T) {
 func Test_in_slice_with_integer(t *testing.T) {
 	require.True(t, str.InSlice(1, 0, 1))
 }
+
+func Test_After(t *testing.T) {
+	// TODO: What if nothing is found?
+	require.Equal(t, "", str.After("", ""))
+	require.Equal(t, "", str.After("", "han"))
+	require.Equal(t, "hannah", str.After("hannah", ""))
+	require.Equal(t, "nah", str.After("hannah", "han"))
+	require.Equal(t, "nah", str.After("hannah", "n"))
+	require.Equal(t, "nah", str.After("eee hannah", "han"))
+	require.Equal(t, "nah", str.After("ééé hannah", "han"))
+	require.Equal(t, "hannah", str.After("hannah", "xxxx"))
+	require.Equal(t, "nah", str.After("han0nah", "0"))
+	require.Equal(t, "nah", str.After("han2nah", "2"))
+}
+
+func Test_AfterLast(t *testing.T) {
+	// TODO: What if nothing is found?
+	require.Equal(t, "", str.After("", ""))
+	require.Equal(t, "", str.After("", "han"))
+	require.Equal(t, "hannah", str.After("hannah", ""))
+	require.Equal(t, "tte", str.AfterLast("yvette", "yve"))
+	require.Equal(t, "e", str.AfterLast("yvette", "t"))
+	require.Equal(t, "e", str.AfterLast("ééé yvette", "t"))
+	require.Equal(t, "", str.AfterLast("yvette", "tte"))
+	require.Equal(t, "yvette", str.AfterLast("yvette", "xxxx"))
+	require.Equal(t, "te", str.AfterLast("yv0et0te", "0"))
+	require.Equal(t, "te", str.AfterLast("yv0et0te", "0"))
+	require.Equal(t, "te", str.AfterLast("yv2et2te", "2"))
+	require.Equal(t, "foo", str.AfterLast("----foo", "---"))
+}
+
+func Test_Before(t *testing.T) {
+	require.Equal(t, "hannah", str.Before("hannah", ""))
+	require.Equal(t, "han", str.Before("hannah", "nah"))
+	require.Equal(t, "ha", str.Before("hannah", "n"))
+	require.Equal(t, "ééé ", str.Before("ééé hannah", "han"))
+	require.Equal(t, "hannah", str.Before("hannah", "xxxx"))
+	require.Equal(t, "han", str.Before("han0nah", "0"))
+	require.Equal(t, "han", str.Before("han0nah", "0"))
+	require.Equal(t, "han", str.Before("han2nah", "2"))
+}
+
+func Test_BeforeLast(t *testing.T) {
+	require.Equal(t, "yve", str.BeforeLast("yvette", "tte"))
+	require.Equal(t, "yvet", str.BeforeLast("yvette", "t"))
+	require.Equal(t, "ééé ", str.BeforeLast("ééé yvette", "yve"))
+	require.Equal(t, "", str.BeforeLast("yvette", "yve"))
+	require.Equal(t, "yvette", str.BeforeLast("yvette", "xxxx"))
+	require.Equal(t, "yvette", str.BeforeLast("yvette", ""))
+	require.Equal(t, "yv0et", str.BeforeLast("yv0et0te", "0"))
+	require.Equal(t, "yv0et", str.BeforeLast("yv0et0te", "0"))
+	require.Equal(t, "yv2et", str.BeforeLast("yv2et2te", "2"))
+}
+
+func Test_Between(t *testing.T) {
+	require.Equal(t, "abc", str.Between("abc", "", "c"))
+	require.Equal(t, "abc", str.Between("abc", "a", ""))
+	require.Equal(t, "abc", str.Between("abc", "", ""))
+	require.Equal(t, "b", str.Between("abc", "a", "c"))
+	require.Equal(t, "b", str.Between("dddabc", "a", "c"))
+	require.Equal(t, "b", str.Between("abcddd", "a", "c"))
+	require.Equal(t, "b", str.Between("dddabcddd", "a", "c"))
+	require.Equal(t, "nn", str.Between("hannah", "ha", "ah"))
+	require.Equal(t, "a]ab[b", str.Between("[a]ab[b]", "[", "]"))
+	require.Equal(t, "foo", str.Between("foofoobar", "foo", "bar"))
+	require.Equal(t, "bar", str.Between("foobarbar", "foo", "bar"))
+}
+
+func Test_Contains(t *testing.T) {
+	require.True(t, str.Contains("taylor", "ylo"))
+	require.True(t, str.Contains("taylor", "taylor"))
+	require.False(t, str.Contains("taylor", "xxx"))
+	require.False(t, str.Contains("taylor", ""))
+	require.False(t, str.Contains("", ""))
+}
+
+func Test_ContainsFromSlice(t *testing.T) {
+	require.True(t, str.ContainsFromSlice("taylor", []string{"ylo"}))
+	require.True(t, str.ContainsFromSlice("taylor", []string{"xxx", "ylo"}))
+	require.False(t, str.ContainsFromSlice("taylor", []string{"xxx"}))
+	require.False(t, str.ContainsFromSlice("taylor", []string{}))
+	require.False(t, str.ContainsFromSlice("taylor", []string{""}))
+}
+
+func Test_ContainsAllFromSlice(t *testing.T) {
+	require.True(t, str.ContainsAllFromSlice("This is my name", []string{"This", "is"}))
+	require.True(t, str.ContainsAllFromSlice("This is my name", []string{"my", "ame"}))
+	require.True(t, str.ContainsAllFromSlice("taylor", []string{"tay", "ylo"}))
+	require.False(t, str.ContainsAllFromSlice("taylor", []string{"xxx", "ylo"}))
+	require.False(t, str.ContainsAllFromSlice("taylor", []string{"xxx", "tay"}))
+	require.False(t, str.ContainsAllFromSlice("This is my name", []string{"are", "name"}))
+	require.False(t, str.ContainsAllFromSlice("taylor", []string{}))
+	require.False(t, str.ContainsAllFromSlice("taylor", []string{"", ""}))
+}
+
+func Test_EndsWith(t *testing.T) {
+	require.True(t, str.EndsWith("This is my name", "name"))
+	require.True(t, str.EndsWith("This is my name", "e"))
+	require.True(t, str.EndsWith("jason", "on"))
+	require.True(t, str.EndsWith("7", "7"))
+	require.True(t, str.EndsWith("a7", "7"))
+	require.False(t, str.EndsWith("jason", "no"))
+	require.False(t, str.EndsWith("jason", ""))
+	require.False(t, str.EndsWith("", ""))
+	// Test for multibyte string support
+	require.True(t, str.EndsWith("Jönköping", "öping"))
+	require.True(t, str.EndsWith("Malmö", "mö"))
+	require.True(t, str.EndsWith("Malmö", "mö"))
+	require.False(t, str.EndsWith("Jönköping", "oping"))
+	require.False(t, str.EndsWith("Malmö", "mo"))
+	require.True(t, str.EndsWith("你好", "好"))
+	require.False(t, str.EndsWith("你好", "你"))
+	require.False(t, str.EndsWith("你好", "a"))
+}
+
+func Test_StartsWith(t *testing.T) {
+	require.True(t, str.StartsWith("jason", "jas"))
+	require.True(t, str.StartsWith("jason", "jason"))
+	require.True(t, str.StartsWith("7a", "7"))
+	require.True(t, str.StartsWith("7", "7"))
+	require.False(t, str.StartsWith("jason", "J"))
+	require.False(t, str.StartsWith("jason", ""))
+	require.False(t, str.StartsWith("", ""))
+	// Test for multibyte string support
+	require.True(t, str.StartsWith("Jönköping", "Jö"))
+	require.True(t, str.StartsWith("Malmö", "Malmö"))
+	require.True(t, str.StartsWith("你好", "你"))
+	require.False(t, str.StartsWith("Jönköping", "Jonko"))
+	require.False(t, str.StartsWith("Malmö", "Malmo"))
+	require.False(t, str.StartsWith("你好", "好"))
+	require.False(t, str.StartsWith("你好", "a"))
+}
+
+func Test_Lower(t *testing.T) {
+	require.Equal(t, "foo bar baz", str.Lower("FOO BAR BAZ"))
+	require.Equal(t, "foo bar baz", str.Lower("fOo Bar bAz"))
+}
+
+func Test_Upper(t *testing.T) {
+	require.Equal(t, "FOO BAR BAZ", str.Upper("foo bar baz"))
+	require.Equal(t, "FOO BAR BAZ", str.Upper("fOo Bar bAZ"))
+}
+
+func Test_Finish(t *testing.T) {
+	require.Equal(t, "abbc", str.Finish("ab", "bc"))
+	require.Equal(t, "abbc", str.Finish("abbcbc", "bc"))
+	require.Equal(t, "abcbbc", str.Finish("abcbbcbc", "bc"))
+	require.Equal(t, "this/string/", str.Finish("this/string", "/"))
+	require.Equal(t, "this/string/", str.Finish("this/string/", "/"))
+}
+
+func Test_Start(t *testing.T) {
+	require.Equal(t, "/test/string", str.Start("test/string", "/"))
+	require.Equal(t, "/test/string", str.Start("/test/string", "/"))
+	require.Equal(t, "/test/string", str.Start("//test/string", "/"))
+}