Validating email address with regular expressions - Program: How to validate email address using regular expression?

The regular expression I receive the most feedback, not to mention "bug" reports on, is the one you'll find right...

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After all, the best way to validate the email address is still to actually send an email to the address in question to validate the address. If you want to get fancy and pedantic, implement a complete state engine. First, long regexes make it difficult to nicely format paragraphs. You have to consider how complex you want your regular expression to be. For your regex of domain part, domain name cannot starts with '-' and cannot ends with '-'.

If you want to know all the trade-offs and get plenty of alternatives to choose from, read on. The official standard is known as RFC

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You have a rules on your website or a dialog box in your application that asks the user proper for an email lecture. You want to use a fixture expression to validate this email location before trying to send email to it. This reduces the number of emails returned to you as undeliverable. This first infusion does a remarkably simple check. It only validates that the string contains an at device that is preceded and followed about one or more nonwhitespace characters.

The domain name Formalized, the part after the sign, is restricted to characters allowed in bailiwick names. Internationalized field names are not allowed. The neighborhood part , the part before the sign, is restricted to characters commonly used in e mail local parts, which is more restrictive than what better email clients and servers will accept: This regular locution expands the above-mentioned one by allowing a larger lay of rarely toughened characters in the local part.

Aggregate the permitted characters are some that present a surveillance risk if passed directly from purchaser input to an SQL statement, such as the unrivaled quote ' and the pipe hieroglyphic. Be sure to escape sensitive characters when inserting the email address into a string passed to another program, in order to prevent security holes such as SQL injection attacks:

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Over the years I have slowly developed a regular expression that validates MOST email addresses correctly, assuming they don't use an IP address as the server part. I use it in several PHP programs, and it works most of the time. However, from time to time I get contacted by someone that is having trouble with a site that uses it, and I end up having to make some adjustment most recently I realized that I wasn't allowing 4-character TLDs.

I've seen several solutions that use functions that use several shorter expressions, but I'd rather have one long complex expression in a simple function instead of several short expression in a more complex function.

The fully RFC compliant regex is inefficient and obscure because of its length. RFC leads to a regex that can be understood if studied for a few minutes and is efficient enough for actual use. One RFC compliant regex can be found at the top of the page at http: The rest of it appears to be consistent with the RFC grammar and passes several tests using grep -Po , including cases domain names, IP addresses, bad ones, and account names with and without quotes.

Correcting the 00 bug in the IP pattern, we obtain a working and fairly fast regex. Scrape the rendered version, not the markdown, for actual code. Here is diagram of finite state machine for above regexp which is more clear than regexp itself. Python and C can do that too, but they use a different syntax from those first two.

ICANN does not allow 'dotless' domains any more: My ill-advised address of! Start Free Trial No credit card required. This requirement is a willful violation of RFC , which defines a syntax for e-mail addresses that is simultaneously too strict before the character , too vague after the character , and too lax allowing comments, whitespace characters, and quoted strings in manners unfamiliar to most users to be of practical use here. For the most comprehensive evaluation of the best regular expression for validating an email address please see this link; " Comparing E-mail Address Validating Regular Expressions " Here is the current top expression for reference purposes:

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The following example uses a regular expression to verify that a string is in valid email format.

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The below given example shows how to validate a email address using regular expression. I'm Nataraja Gootooru, programmer by profession and passionate about...

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