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https://help.xmatters.com/ondemand/trial/valid_email_format.htm script validate email can 255 chracter https://html.chaucc.top/?html=https://gist.githubusercontent.com/tranchausky/5a2264d024a2e5bb2fa52ac8b4ac185f/raw/462e3f12e5899979badd4846efc24592a28813d9/demo-validate-email-script.html
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>Email Validation Strict Demo</title> | |
| <style> | |
| input { | |
| width: 320px; | |
| padding: 8px; | |
| font-size: 16px; | |
| } | |
| .valid { | |
| border: 2px solid green; | |
| } | |
| .invalid { | |
| border: 2px solid red; | |
| } | |
| #message { | |
| font-size: 14px; | |
| margin-top: 5px; | |
| } | |
| #message.valid { | |
| color: green; | |
| } | |
| #message.invalid { | |
| color: red; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h2>Strict Email Validation</h2> | |
| <input type="text" id="emailInput" placeholder="Enter your email" /> | |
| <div id="message"></div> | |
| <script> | |
| function isValidEmail(email) { | |
| const emailRegex = /^[a-zA-Z0-9](\.?[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-])*[a-zA-Z0-9]@([a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}$/; | |
| if (email.includes('..')) return false; | |
| if (email.indexOf('#') !== -1) return false; | |
| return emailRegex.test(email); | |
| } | |
| const input = document.getElementById('emailInput'); | |
| const message = document.getElementById('message'); | |
| input.addEventListener('blur', () => { | |
| const val = input.value.trim(); | |
| if (!val) { | |
| input.className = ''; | |
| message.textContent = ''; | |
| return; | |
| } | |
| if (isValidEmail(val)) { | |
| input.className = 'valid'; | |
| message.textContent = 'Valid email address'; | |
| message.className = 'valid'; | |
| } else { | |
| input.className = 'invalid'; | |
| message.textContent = 'Invalid email address'; | |
| message.className = 'invalid'; | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| https://html.chaucc.top/?html=https://gist.githubusercontent.com/tranchausky/5a2264d024a2e5bb2fa52ac8b4ac185f/raw/462e3f12e5899979badd4846efc24592a28813d9/demo-validate-email-script.html |
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| $.validator.methods.emailnew = function (email, element) { | |
| const emailRegex = /^[a-zA-Z0-9](\.?[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-])*[a-zA-Z0-9]@([a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}$/; | |
| if (email.includes('..')) return false; | |
| if (email.indexOf('#') !== -1) return false; | |
| return emailRegex.test(email); | |
| } |
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| console.log(isValidEmail("[email protected]")); // false (TLD 1 char) | |
| console.log(isValidEmail("abc.def@mail#archive.com"));// false (# in domain) | |
| console.log(isValidEmail("abc.def@mail")); // false (no TLD) | |
| console.log(isValidEmail("[email protected]")); // false (double dot domain) | |
| console.log(isValidEmail("[email protected]")); // false (local ends with '-') | |
| console.log(isValidEmail("[email protected]")); // false (double dot local) | |
| console.log(isValidEmail("[email protected]")); // false (local starts with '.') | |
| console.log(isValidEmail("abc#[email protected]")); // false (# in local) | |
| console.log(isValidEmail("[email protected]")); // true (valid) | |
| console.log(isValidEmail("[email protected]")); // true (valid) | |
| gfdgggggggggggggggggggggggggggggggggrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrryyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyywwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwffffffffffffffffffffffffff@ |
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| function isValidEmail(email) { | |
| // Basic regex with stricter local and domain rules: | |
| // Local part: starts and ends with alphanumeric, no consecutive dots or special chars at ends | |
| // Domain: labels with letters, digits, hyphens, separated by single dots, TLD >= 2 letters | |
| const emailRegex = /^[a-zA-Z0-9](\.?[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-])*[a-zA-Z0-9]@([a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}$/; | |
| // Disallow consecutive dots anywhere | |
| if (email.includes('..')) return false; | |
| // Disallow invalid characters (only allow listed in regex) | |
| // Extra check for # in email | |
| if (email.indexOf('#') !== -1) return false; | |
| // Validate with regex | |
| return emailRegex.test(email); | |
| } |
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