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How to validate an email address using a regular expression?
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What is the maximum length of a valid email address?
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Identify which OrgWideEmailAddress records are valid for current user
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How do I extract the domain out of an URL?
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Is there a regular expression to detect a valid regular expression?
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What regular expression will match valid international phone numbers?
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Extract domain from url (including the hard ones)
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regular expression for email validation in Java
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How do I create a rule in Outlook for handling emails which are not sent using the senders domain
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Use email to validate post, not unlike craigslist
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Regular expression for address field validation
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How can you check for a #hash in a URL using JavaScript?
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Password validation (regex?)
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How do I verify that a string only contains letters, numbers, underscores and dashes?
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How to validate an Email in PHP?
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How does this regular expression work?
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JavaScript regular expressions and sub-matches