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How can I get a string that only contains a to z, A to Z, 0 to 9 and some symbols?
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Definition and Usage The [0-9] expression is used to find any character between the brackets. The digits inside the brackets can be any numbers or span of numbers from 0 to 9.
PHP | preg_match() Function. This function searches string for pattern, returns true if pattern exists, otherwise returns false. Usually search starts from beginning of subject string. The optional parameter offset is used to specify the position from where to start the search.
Character classes The character class is the most basic regex concept after a literal match. It makes one small sequence of characters match a larger set of characters. For example, [A-Z] could stand for any uppercase letter in the English alphabet, and \d could mean any digit.
Definition and Usage The preg_match() function returns whether a match was found in a string.
You can filter it like:
$text = preg_replace("/[^a-zA-Z0-9]+/", "", $text);
As for some symbols, you should be more specific
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