[Issue 15750] New: net/isemail uses lots of redundant helper methods

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15750

          Issue ID: 15750
           Summary: net/isemail uses lots of redundant helper methods
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: greeenify at gmail.com

In my cleanup task I saw that std.net.isemail seems to do some redundant effort
and defines those methods as its own helper:

- substr
- max
- compareFirstN
- grep
- get

There is `backPop`!

All of these methods (at least max, substr) feel general purpose enough that
they should existent in a general fashion.

Btw for max: doesn't work get with ranges, but there is a pending pull request.
https://github.com/D-Programming-Language/phobos/pull/4019

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