x/ibc ICS24 (#5588)

* x/ibc ICS24

* changelog

* move regex to /types

* address @alexanderbez comments

Co-authored-by: Jack Zampolin <jack.zampolin@gmail.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

types/router.go

@@ -2,9 +2,27 @@ package types
 
 import "regexp"
 
-// IsAlphaNumeric defines a regular expression for matching against alpha-numeric
-// values.
-var IsAlphaNumeric = regexp.MustCompile(`^[a-zA-Z0-9]+$`).MatchString
+var (
+	// IsAlphaNumeric defines a regular expression for matching against alpha-numeric
+	// values.
+	IsAlphaNumeric = regexp.MustCompile(`^[a-zA-Z0-9]+$`).MatchString
+
+	// IsAlphaLower defines regular expression to check if the string has lowercase
+	// alphabetic characters only.
+	IsAlphaLower = regexp.MustCompile(`^[a-z]+$`).MatchString
+
+	// IsAlphaUpper defines regular expression to check if the string has uppercase
+	// alphabetic characters only.
+	IsAlphaUpper = regexp.MustCompile(`^[A-Z]+$`).MatchString
+
+	// IsAlpha defines regular expression to check if the string has alphabetic
+	// characters only.
+	IsAlpha = regexp.MustCompile(`^[a-zA-Z]+$`).MatchString
+
+	// IsNumeric defines regular expression to check if the string has numeric
+	// characters only.
+	IsNumeric = regexp.MustCompile(`^[0-9]+$`).MatchString
+)
 
 // Router provides handlers for each transaction type.
 type Router interface {