There is a problem in calculated/questiontype.php
Warning: preg_match() [function.preg-match]: Unknown modifier '<' in C:\moodle\moodle\site\moodle_head\question\type\calculated\questiontype.php on line 1899
This 1899 line explore the math formula.
$safeoperatorchar = '-+/%>:^~<?=&|!'; / */
$operatorornumber = "[$safeoperatorchar.0-9eE]";
while (preg_match("~(^|[$safeoperatorchar,(])([a-z0-9_]*)\\(($operatorornumber+(,$operatorornumber+((,$operatorornumber+)+)?)?)?
)~",
$formula, $regs)) {
Sub-task
Closed
Minor
Attached a patch with ereg -> preg replacements. Please review