refactor :: 점(.)만 허용되게 정규식 수정

Author: uson1004

shared/validator/src/main/java/team/aliens/dms/android/shared/validator/EmailValidator.kt

@@ -2,7 +2,7 @@ package team.aliens.dms.android.shared.validator
 
 object EmailValidator : Validator<String>() {
     override val regex =
-        Regex("^[0-9a-zA-Z]([-_.]?[0-9a-zA-Z])*@[0-9a-zA-Z]([-_.]?[0-9a-zA-Z])*.[a-zA-Z]{2,3}\$")
+        Regex("^[0-9a-zA-Z]([-_.]?[0-9a-zA-Z])*@[0-9a-zA-Z]([-_.]?[0-9a-zA-Z])*\\.[a-zA-Z]{2,3}\$")
 
     override fun validate(value: String): Boolean = value.matches(regex)
 }