A pattern for a mobile phone?

Question

PHP

Help compose a regular expression for a mobile phone with +. Everything I searched on Google doesn't work. I try like this:

if (preg_match('^\+\d{7,15}$', $_GET['num'])) echo 'ok';
else echo 'error';

so

if (preg_match("/^\+\d{7,15}$/", $_GET['num'])) echo 'ok';
else echo 'error';

I get in the first case error and warning

Warning: preg_match(): No ending delimiter '^' found

, in the second error

Answer 1

In php, you need to wrap the regular expression in paired characters

~^\+\d{7,15}$~
/^\+\d{7,15}$/
`^\+\d{7,15}$`