PHP: How to tell if a string contains any special characters?
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preg_match special characters
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PHP removing a character in a string
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Unicode character in PHP string
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How to compare Unicode strings in Javascript?
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What to do Regular expression pattern doesn't match anywhere in string?
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How to detect the language of a string?
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Why my php substr() shows obscure characters when cutting a text?
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PHP: How to sort the characters in a string?
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Is it possible to search for punctuation/special characters?
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Strpos with exact matches
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Print a string including single quotes and other special characters
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How can I detect onclick() or similar for individual characters in a text?
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Check if string is a punctuation character
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Verifying that a string contains only letters in C#
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Right way to escape backslash [ \ ] in PHP regex?
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Determining whether a string has a substring (word)
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Check if a string contains a string in C++