RegEx vs. Manually Parsing String (PHP Performance) -

is there problem (performance-wise) manually parsing string follows, opposed using regular expressions or built in string replacement functions?

for ($i=0;$i<strlen($string);$i++) {     $thischar = $string[$i];     //do more stuff }

thanks!

there things done more efficient custom code regex.

as long both have same o complexity , not handling humongous strings, readability , maintainability should equally or more important argument.

for actual performance benchmark compare 2 solutions.

HR