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php Programming Glossary: negationHow to evaluate formula passed as string in PHP? http://stackoverflow.com/questions/1015242/how-to-evaluate-formula-passed-as-string-in-php m evaluate '2 2' supports order of operation parentheses negation built in functions result m evaluate ' 8 5 2 ^2 1 sqrt 4 8'.. syntax checking the expression and determining when a is a negation if preg_match ^ w s ^ . expr matches make sure the characters.. expr index match if op ' ' and expecting_op is it a negation instead of a minus stack push '_' put a negation on the stack..
Regex help: Match any image file beginning with an underscore http://stackoverflow.com/questions/2139627/regex-help-match-any-image-file-beginning-with-an-underscore php regex share improve this question Just remove the negation on the character set ^_ becomes _ if is_dir file preg_match..
What literal characters should be escaped in a regex? http://stackoverflow.com/questions/5484084/what-literal-characters-should-be-escaped-in-a-regex rules apply Meta characters inside a character class are ^ negation range end of the class escape char So these should all be escaped...
Remove all except the chinese characters with regex? http://stackoverflow.com/questions/8989133/remove-all-except-the-chinese-characters-with-regex string or preg_replace ' P Han ' '' string where P is the negation of p see here for all the unicode scripts share improve this..
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