How can I convert ereg expressions to preg in PHP?

How can I convert ereg expressions to preg in PHP?

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"Unknown modifier 'g' in..." when using preg_match in PHP?

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Delimiter must not be alphanumeric or backslash and preg_match

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Split camelCase word into words with php preg_match (Regular Expression)

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preg_match(): Compilation failed: invalid range in character class at offset

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How to search in an array with preg_match?

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Optional Whitespace Regex

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PHP - regex to allow letters and numbers only

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PHP preg_match and preg_match_all functions

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Regex to match an IP address [closed]

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PHP is_numeric or preg_match 0-9 validation

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PHP preg_replace/preg_match vs PHP str_replace

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Validate username as alphanumeric with underscores

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Regular expression preg_quote symbols are not detected

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php only allow letters, numbers, spaces and specific symbols using pregmatch

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