This regular expression provides a balance between RFC compliance and security-best-practices. It is designed to prevent injection vectors in legacy systems by using a restricted "safe" character subset recommended by the OWASP Validation Regex Repository. Pattern: ^A-Za-z0-9(?:\.A-Za-z0-9_+&-]+)*@(?:[A-Za-z0-9{0,61}[A-Za-z0-9])?\.)+[A-Za-z]{2,63}$ Key Features: Forced Alphanumeric Start: Prevents leading hyphens to avoid command injection vulnerabilities. Security Subset: Restricts special characters to _+&*- to prevent exotic character injections (e.g., pipes or backticks). No Quoted Strings: Forbids quoted strings to eliminate dangerous payloads containing spaces or backslashes. DNS Compliance: Enforces label lengths (1–63 characters) and prevents labels from starting or ending with hyphens. Whole String Anchoring: Uses ^ and $ to ensure the entire input is validated.

Compliant with RFC 5322

^ - This indicates the beginning of the expression. - This part specifies that the first character cannot be a digit, hyphen, or underscore. So the first character must be a letter, period, or other special character. [A-z0-9.-]+ - This part requires the username to contain at least one character, and that character can be a letter, digit, period, or hyphen. @ - This represents the "@" symbol in the email address. [A-z.-]+ - This section states that the domain part must contain at least one character, and that character can be a letter, period, or hyphen. . - This represents the period character used to separate the domain from the top-level domain. [A-z]+ - This part requires the top-level domain to contain at least one character, and that character can only be a letter. $ - This indicates the end of the expression. ^ - Bu, ifadenin başlangıcını belirtir. - Bu bölüm, ilk karakterin rakam, tire veya alt çizgi olmaması gerektiğini belirtir. Yani ilk karakter harf, nokta veya diğer özel karakterlerden biri olmalıdır. [A-z0-9.-]+ - Bu kısım, kullanıcı adının en az bir karakter içermesi ve harf, rakam, nokta veya tire karakterlerinden oluşması gerektiğini gösterir. @ - Bu, e-posta adresindeki "@" sembolünü temsil eder. [A-z.-]+ - Bu bölüm, etki alanı kısmının en az bir karakter içermesi ve harf, nokta veya tire karakterlerinden oluşması gerektiğini belirtir. . - Bu, etki alanı uzantısını ayırmak için nokta karakterini gösterir. [A-z]+ - Bu kısım, etki alanı uzantısının en az bir karakter içermesi ve yalnızca harflerden oluşması gerektiğini ifade eder. $ - Bu, ifadenin sonunu belirtir.

derm-link.com

elegenttech.com

This code used to validate any email.

Email validation Explanation ^(?!.*@.*@) Asserts that the string does not contain two consecutive “@” symbols. * (?!.\.\.)** Ensures that there are no consecutive periods (“.”) in the string. ^a-zA-Z0-9._%+-]{1,64}@ Matches an email address with a maximum length of 64 characters before the “@” symbol. It allows alphanumeric characters, dots, underscores, percent signs, plus signs, and hyphens. ([a-zA-Z0-9.-]+\.[a-zA-Z]{2,}(?:\.[a-zA-Z]{2,255})?)$ Captures the domain part of the email address. It allows alphanumeric characters, dots, and hyphens. (?:\.[a-zA-Z]{2,255})? This group allows for optional subdomains (e.g., “.foo.bar”). Includes valid local part Hostpart valid TLD optional SLD unique @ No double dots > .. If you have any improvements or issues: [Cxbersxnic - Github

validate email address according to RFC 5322 specification. I tried to optimize regex radically restructuring the original BNF-like specification with full support preserved.

Basic email address validation example

Simple email validation based loosely on https://en.wikipedia.org/wiki/Email_address

RegEx pattern to match email addresses. Visit the detailed tutorial to learn more.

Vaild: valid.email@example.com john.doe123@example.co.uk alice_smith@company.org user1234@emailprovider.net test.email1234@email-domain.com support@website.info jane.doe@emailprovider.org contact_us123@example.net my.email123@email-provider.co Invalid: a@ce.ce invalid.email@missingtld john.doe@invaliddomain.c spaces in@email.com special!chars@email.com noatemail.com double..dots@email.com @missingusername.com user@inva@lid.com missingatsigndomain.com

Source: https://html.spec.whatwg.org/#e-mail-state-(type=email)

ECMAScript simple regex for email validation

^([a-z0-9]+(?:([-]+|[.])[\w-]+|[-]))@([a-z0-9]+(?:([.-]\w+)\.)[a-z]{2,13})$

Source Mozilla.

This is an Email validation using RegExp.

Extract this regex from EmailValidation.php

Validates email

This is used for simple email validation

Only meant as an initial client-side filter to override the default input[type=email] validation done according to spec, which is much too simple. Inputs passing this regex MUST get validated in a more fine-grained manner again when received on the server-side

email validation

invalid email abc abc.com valid email address abc@mail.com abc@mail.nz abc@mail.co.nz abc123@mail.com abc.def@music.com invalid email prefix abc-@mail.com abc..def@mail.com .abc@mail.com abc#def@mail.com valid email prefix abc-d@mail.com abc.def@mail.com abc@mail.com abc_def@mail.com invalid domain suffix abc.def@mail.c abc.def@mail#archive.com abc.def@mail abc.def@mail..com valid domain suffix abc.def@mail.cc abc.def@mail-archive.com abc.def@mail.org abc.def@mail.com fully-qualified-domain@example.com

validation email

Safe EMail validation protected against ReDos attack. Exclude all non conventionnal special char like #{%... only accept . - and _. . EMail can't start with number or specials chars. Domain accept only one subdomain and ip are available 63 Maximum characters accepted Check for valid IP

Safe EMail validation protected against ReDos attack. It exclude all non conventionnal special char like #{%... only accept . - and _. . EMail can't start with number or specials chars. Domain accept only one subdomain and ip are available 63 Maximum characters accepted

Basic email regex for quick validation

Regex to validate an email input with the following rules... Whole address: Up to 254 characters. Case insensitive. Username and domain separated by @ symbol. Only one @ symbol allowed. No spaces allowed. Username: 1 to 64 characters. Any letter, digit and symbol from these #!%$'&+*-/=?^_.{|}~ are allowed. It cannot start or end with a dot. It cannot have two (or more) consecutive dots. Domain: Only letters, digits and hyphens (and dots of course) allowed. It cannot start or end with a dot. Unlimited number of labels separated by one dot allowed. No label can start nor end with hyphens. It cannot have two (or more) consecutive dots. 2 to 63 characters per label. It cannot have an all-numerical TLD.

This email validation regex works perfectly (99.99%) for validating email address entries. The regex does not match email addresses with with the following characteristics: Addresses that begin/end with a special character Addresses with consecutive repeated special characters Special characters matched are: Period (".") Hyphen ("-") Underscore ("_") https://regex101.com/r/0NVXwu/1

Email Validation Regex

Simple email validator (x@x.x) Note: Use /g to test all example emails.

Validate a list of emails separated by a semicolon. Supports emails with accents and other alphabets. Valid email: Abc@example.com;Abc.123@example.com;user+mailbox/department=shipping@example.com;éüöä^0@émäil.côm !#$%&'*+-/=?^_`.{|}~@example.com;"Abc@def"@example.com;"Fred Bloggs"@example.com;"Joe.\\Blow"@example.com;Loïc.Accentué@voilà.fr δοκιμή@παράδειγμα.δοκιμή;我買@屋企.香港;二ノ宮@黒川.日本;медведь@с-балалайкой.рф;संपर्क@डाटामेल.भारत

It won't recognize if the local-part is just one character like t@somedomain.com

Regex for email validation

To validate email.

Email Validation Pattern

This validate all most all email addresses.

Regular Expression ^(?=a-z{5,40}$)a-z0-9._-]{1,20}@(?:(?=[a-z0-9-]{1,15}\.)[a-z0-9]+(?:-[a-z0-9]+)*\.){1,2}[a-z]{2,6}$ By default, the app converts all the email value to lower case before validation. Please use [regex101.com: email to analyse and validate the regex. The error message for an invalid format, (to be translatable in Ar is supported). Please insert a valid email address. Example Valid sample: a@bo.ae

Writes a regular expression that performs simple email validation An email consists of: username @ domain name Usernames are alphanumeric Domain names consist of two strings, separated by a period Domain names may contain only English letters ^ means that the pattern should start at the beginning of the row $ means that the pattern should end at the end of the row

check valid email

Email validation with support with new TLD up to 24 characters

Supposedly 99.99% effective way to capture most potentially-valid email addresses in .NET syntax.

Solves the practice problem from https://www.sitepoint.com/learn-regex/

Validate email

opinionated email validation based on https://en.wikipedia.org/wiki/Email_address. i have excluded some email patterns that don't seem to be common

basic email validation

valid mails abc@yahoo.com abc-100@yahoo.com abc.100@yahoo.com abc111@abc.com abc-100@abc.net abc.100@abc.com.au abc@1.com abc@gmail.com.com abc+100@gmail.com invalid mails abc abc@.com.my abc123@gmail.a abc123@.com abc123@.com.com .abc@abc.com abc()*@gmail.com abc@%*.com abc..2002@gmail.com abc.@gmail.com abc@abc@gmail.com abc@gmail.com.1a abc@gmail.com.aa.au

matches most fully qualified domain addresses with ability to match sub-domains,

Email string validation, manage wildcard and subdomains