UPDATE: Auth module, User module

pkg/constants/regex.go

@@ -0,0 +1,39 @@
+package constants
+
+import (
+	"errors"
+	"regexp"
+)
+
+var (
+	// Password components (Go-compatible)
+	hasUpper   = regexp.MustCompile(`[A-Z]`)
+	hasLower   = regexp.MustCompile(`[a-z]`)
+	hasNumber  = regexp.MustCompile(`\d`)
+	hasSpecial = regexp.MustCompile(`[!@#$%^&*()_+{}|:<>?~-]`)
+
+	// Standard Regexes
+	PHONE_NUMBER_REGEX     = regexp.MustCompile(`^\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$`)
+	EMAIL_REGEX            = regexp.MustCompile(`^[a-z0-9._%+\-]+@[a-z0-9.\-]+\.[a-z]{2,4}$`)
+	YOUTUBE_VIDEO_ID_REGEX = regexp.MustCompile(`(?:\/|v=|\/v\/|embed\/|watch\?v=|watch\?.+&v=)([\w-]{11})`)
+	BANK_INPUT             = regexp.MustCompile(`[_＿]{2,}`)
+)
+
+func ValidatePassword(password string) error {
+	if len(password) < 8 {
+		return errors.New("password must be at least 8 characters long")
+	}
+	if !hasUpper.MatchString(password) {
+		return errors.New("password must contain at least one uppercase letter")
+	}
+	if !hasLower.MatchString(password) {
+		return errors.New("password must contain at least one lowercase letter")
+	}
+	if !hasNumber.MatchString(password) {
+		return errors.New("password must contain at least one number")
+	}
+	if !hasSpecial.MatchString(password) {
+		return errors.New("password must contain at least one special character")
+	}
+	return nil
+}