问题
So the official documentation says absolutely nothing about the tilde sign (~) used in regexp patterns, for example as in the seeCurrentUrlMatches() function. Yet, it is used extensively in the documentation.
In the exmample, the regexp looks like this:
$I->seeCurrentUrlMatches('~$/users/(\d+)~');
- Without the tilde sign, it gives an error. eg.
grabFromCurrentUrl('(\d+)')returns:" (\d+)" Fail Nothing to grab. A regex parameter required.
- The end-of-string regexp operator's (
$) position makes no sense (I presume the dollar sign has a completely different meaning in this context /my guess would be shorthand for the home path/.) - In standard regexp, the
~captures the character itself
My conclusion is the regexp pattern that Codeception expects from you is clearly non-standard. So what does the ~ and $ do? Where can I find a throughout documentation or article about this?
回答1:
Codeception doesn't use any special regex functions.
seeCurrentUrlMatches method calls PhpUnit's assertRegexp method which uses preg_match under the hood.
preg_match uses pattern delimiters. Delimiter can be any non-alphanumeric character.
/ is the most common delimiter, but it is inconvenient for matching URL, because you would have to escape a lot of slashes in URL, so using ~ as a delimiter avoids need to escape.
$ at the beginning of pattern is probably a simple mistake in example.
来源：https://stackoverflow.com/questions/51742632/codeception-url-regex