Function format_float broken when decsep is '~' (tilde)

Automated testing Run the automated tests and verify that the format_float test in core_moodlelib_testcase completes with success. Manual testing Set decsep to '~' in a language file for your currently enabled language. Ensure that the change is picked up (by flushing the language strings cache or updating version.php ). Put the following test code into a script file (named mytestscript.php below) and run it with PHP from the command line. <?php require ( '/path/to/config.php' ); // causes inclusion of moodlelib.php echo format_float(1.234, 5, true, true); Run the script: php mytestscript.php Check the test result: Ensure that you do not see the following warning: PHP Warning: preg_replace(): Unknown modifier ')' in /path/to/format_float_test.php on line <linenumber> Verify that you see the following output: 1~234 (No PHP warning message.)