问题
For a long time, any time I've needed to use a regular expression, I've standardized on using the copyright symbol © as the delimiter because it was a symbol that wasn't on the keyboard that I was sure to not use in a regular expression, unlike ! @ # \ or / (which are sometimes all in use within in a regex).
Code:
$result=preg_match('©<.*?>©', '<something string>');
However, today I needed to use a regular expression with accented characters which included this:
Code:
[a-zA-ZàáâäãåąćęèéêëìíîïłńòóôöõøùúûüÿýżźñçčšžÀÁÂÄÃÅĄĆĘÈÉÊËÌÍÎÏŁŃÒÓÔÖÕØÙÚÛÜŸÝŻŹÑßÇŒÆČŠŽ∂ð \,\.\'-]+
After including this new regex in the PHP file in my IDE (Eclipse PDT), I was prompted to save the PHP file as UTF-8 instead of the default cp1252.
After saving and running the PHP file, every time I used a regex in a preg_match() or preg_replace() function call, it generated a generic PHP warning (Warning: preg_match in file.php on line x) and the regex was not processed.
So--two questions:
1) Is there another symbol that would be good to use as a delimiter that isn't typically found on a keyboard (`~!@#$%^&*()+=[]{};\':",./<>?|\) that I can standardize on and not worry about having to check each and every regex to see if that symbol is actually used somewhere in the expression?
2) Or, is there a I way I can use the copyright symbol as the standard delimiter when the file format is UTF-8?
来源：https://stackoverflow.com/questions/17725993/php-regex-delimiter