query: php regular expression for phone numbers with diffrent lenght and space or hyphen
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positive_passages.text: How to validate phone numbers using regex
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negative_passages.text: How to match hyphens with Regular Expression?
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negative_passages.text: Regular Expression for alphanumeric and underscores
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negative_passages.text: RegEx to make sure that the string contains at least one lower case char, upper case char, digit and symbol
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negative_passages.text: Delete first 3 characters and last 3 characters from String PHP
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negative_passages.text: Is there a regular expression to detect a valid regular expression?
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negative_passages.text: Php regex date validation