note 126055 deleted from intro.bc by cmb

Note Submitter: crtmsvc at gmail dot com ---- The regular expression is not quite right as I testing. The number 20.00000509 which not match /^[+-]?[0]*[1-9]*[.]?[0-9]*$/ will pass the bcmatch format. I think reference to source in the php_str2num function will be better. It is more like /^[+-]?(0|[1-9][0-9]*)[.]?[0-9]*$/ to me. https://github.com/php/php-src/blob/master/ext/bcmath/bcmath.c