andrewhodel · June 16, 2023 21:10 · Jun 16, 2023 · May 10, 2023 · Apr 18, 2023 · Apr 18, 2023
diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -74,8 +74,8 @@ var domain_validate = function(s) {
 
 	var tld = domain_parts[domain_parts.length - 1];
 
-	if (tld.length < 2 || tld.length > 3) {
-		// tld must be 2 or 3 characters long
+	if (tld.length < 2 || tld.length > 63) {
+		// tld must be 2-63 characters long
 		return false;
 	}
 

diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -23,7 +23,11 @@ var email_validate = function(s) {
 		return false;
 	}
 
-	if (local_part.match(/[\p{L}\p{N}\.!#\$%&'\\\*\+-/=\?\^_`\{\|\}~]/gu).length !== local_part.length) {
+	var lp_m = local_part.match(/[\p{L}\p{N}\.!#\$%&'\\\*\+-/=\?\^_`\{\|\}~]/gu);
+	if (lp_m === null) {
+		// all invalid characters
+		return false;
+	} else if (lp_m.length !== local_part.length) {
 		// invalid character in local part
 		return false;
 	}
@@ -74,8 +78,12 @@ var domain_validate = function(s) {
 		// tld must be 2 or 3 characters long
 		return false;
 	}
-
-	if (tld.match(/[\p{L}]/gu).length !== tld.length) {
+
+	var tld_m = tld.match(/[\p{L}]/gu);
+	if (tld_m === null) {
+		// all invalid
+		return false;
+	} else if (tld_m.length !== tld.length) {
 		// tld must be letters only
 		return false;
 	}
@@ -86,7 +94,11 @@ var domain_validate = function(s) {
 	var c = 0;
 	while (c < domains.length) {
 
-		if (domains[c].match(/[\p{L}\p{N}-]/gu).length !== domains[c].length) {
+		var domain_m = domains[c].match(/[\p{L}\p{N}-]/gu);
+		if (domain_m === null) {
+			// all invalid characters in domain part
+			return false;
+		} else if (domain_m.length !== domains[c].length) {
 			// invalid characters in domain part
 			return false;
 		} else if (domains[c][0] === '-' || domains[c][domains[c].length - 1] === '-') {
@@ -100,7 +112,7 @@ var domain_validate = function(s) {
 		c++;
 
 	}
-	
+
 	return true;
 
 }
diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -55,7 +55,7 @@ var domain_validate = function(s) {
 		return false;
 	}
 
-	if (s.length > 253) {
+	if (s.length > 255) {
 		// domain part is too long
 		return false;
 	}

diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -100,5 +100,7 @@ var domain_validate = function(s) {
 		c++;
 
 	}
+
+	return true;
 
 }
diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -55,7 +55,7 @@ var domain_validate = function(s) {
 		return false;
 	}
 
-	if (s.length > 255) {
+	if (s.length > 253) {
 		// domain part is too long
 		return false;
 	}

diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -55,7 +55,7 @@ var domain_validate = function(s) {
 		return false;
 	}
 
-	if (s.length > 253) {
+	if (s.length > 255) {
 		// domain part is too long
 		return false;
 	}

diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -74,6 +74,11 @@ var domain_validate = function(s) {
 		// tld must be 2 or 3 characters long
 		return false;
 	}
+
+	if (tld.match(/[\p{L}]/gu).length !== tld.length) {
+		// tld must be letters only
+		return false;
+	}
 
 	// domains contain letters, digits hyphens and dots
 	var domains = domain_parts.slice(0, domain_parts.length-1);

diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -87,6 +87,9 @@ var domain_validate = function(s) {
 		} else if (domains[c][0] === '-' || domains[c][domains[c].length - 1] === '-') {
 			// - must not be the first or last character
 			return false;
+		} else if (domains[c].length > 63) {
+			// must be 63 characters or less
+			return false;
 		}
 
 		c++;

diff --git a/email_domain_validation.js b/email_domain_validation.js
@@ -0,0 +1,96 @@
+var email_validate = function(s) {
+
+	if (typeof(s) !== 'string') {
+		return false;
+	}
+
+	var parts = s.split('@');
+
+	if (parts.length !== 2) {
+		// should be local-part@domain.tld
+		return false;
+	}
+
+	var local_part = parts[0];
+
+	if (local_part.length > 64) {
+		// local_part is too long
+		return false;
+	}
+
+	if (local_part[0] === '.' || local_part[local_part.length - 1] === '.') {
+		// . must not be the first or last character
+		return false;
+	}
+
+	if (local_part.match(/[\p{L}\p{N}\.!#\$%&'\\\*\+-/=\?\^_`\{\|\}~]/gu).length !== local_part.length) {
+		// invalid character in local part
+		return false;
+	}
+
+	if (domain_validate(parts[1]) === false) {
+		// domain failed validation
+		return false;
+	}
+
+	return true;
+
+}
+
+var domain_validate = function(s) {
+
+	if (typeof(s) !== 'string') {
+		return false;
+	}
+
+	/*
+	The labels must follow the rules for ARPANET host names.  They must
+	start with a letter, end with a letter or digit, and have as interior
+	characters only letters, digits, and hyphen.  There are also some
+	restrictions on the length.  Labels must be 63 characters or less.
+	*/
+
+	if (s.indexOf('..') !== -1) {
+		// a domain should never have two sequential dots because only one dot is used between subdomains
+		return false;
+	}
+
+	if (s.length > 253) {
+		// domain part is too long
+		return false;
+	}
+
+	var domain_parts = s.split('.');
+
+	if (domain_parts.length < 2) {
+		// must be at least 2 parts, domain.tld
+		// can include subdomains
+		return false
+	}
+
+	var tld = domain_parts[domain_parts.length - 1];
+
+	if (tld.length < 2 || tld.length > 3) {
+		// tld must be 2 or 3 characters long
+		return false;
+	}
+
+	// domains contain letters, digits hyphens and dots
+	var domains = domain_parts.slice(0, domain_parts.length-1);
+
+	var c = 0;
+	while (c < domains.length) {
+
+		if (domains[c].match(/[\p{L}\p{N}-]/gu).length !== domains[c].length) {
+			// invalid characters in domain part
+			return false;
+		} else if (domains[c][0] === '-' || domains[c][domains[c].length - 1] === '-') {
+			// - must not be the first or last character
+			return false;
+		}
+
+		c++;
+
+	}
+
+}
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