问题
^([-+]?)([\d]{1,2})(((\.)(\d+)(,)))(([-+]?)([\d]{1,3})((\.)(\d+))?)$
I am trying to use this regex above to be able to confirm that the data is a valid coordinate. I am having trouble getting this to work with Firebase rules. When i run the regex in an online regex tester, it works okay, but Firebase rules doesn't seem to accept it.
Here is my firebase rule:
".validate": "newData.isString() && newData.val().matches(/^([-+]?)([\d]{1,2})(((\.)(\d+)(,)))(([-+]?)([\d]{1,3})((\.)(\d+))?)$/)"
Is there anyway to get this working?
回答1:
You need to double the escaping backslashes, but honestly, your expression contains too many redundant grouping constructs.
Use
.matches(/^[-+]?\\d{1,2}\\.\\d+,[-+]?\\d{1,3}(\\.\\d+)?$/)
or avoid the backslashes altogether:
.matches(/^[-+]?[0-9]{1,2}[.][0-9]+,[-+]?[0-9]{1,3}([.][0-9]+)?$/)
The regex will match strings like in this online demo.
Details:
^- start of string (in Firebase regex, it is an anchor when used at the start of the pattern only)[-+]?- 1 or 0+or-[0-9]{1,2}- 1 or 2 digits[.]- a dot[0-9]+- 1+ digits,- a comma[-+]?- 1 or 0+or-[0-9]{1,3}- 1 to 3 digits([.][0-9]+)?- 1 or 0 sequences of.and 1+ digits (note that non-capturing groups are not supported)$- end of string anchor (only when at the pattern end,$matches the end of string in Firebase regex).
来源：https://stackoverflow.com/questions/44220860/firebase-rules-regex-troubles