修改 email 的正则常量

1. fix: Email 的 Pattern 不区分大小写
2. docs: 标注正则表达式的出处

src/main/java/xyz/zhouxy/plusone/commons/constant/PatternConsts.java

@@ -61,7 +61,7 @@ public final class PatternConsts {
      *
      * @see RegexConsts#EMAIL
      */
-    public static final Pattern EMAIL = Pattern.compile(RegexConsts.EMAIL);
+    public static final Pattern EMAIL = Pattern.compile(RegexConsts.EMAIL, Pattern.CASE_INSENSITIVE);
 
     /**
      * 中国大陆手机号

src/main/java/xyz/zhouxy/plusone/commons/constant/RegexConsts.java

@@ -32,6 +32,9 @@ public final class RegexConsts {
 
     public static final String CAPTCHA = "^\\w{4,6}$";
 
+    /**
+     * from https://emailregex.com/
+     */
     public static final String EMAIL
             = "(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")"
             + "@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])";