Valid Numeric String
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You are working as a software engineer at a company that develops a financial trading platform. Your team is working on a new feature that allows users to enter numeric strings into a text field and have them parsed and converted into numbers.
One of the requirements for this feature is that the numeric strings must be valid. A valid numeric string must consist of:
A sign character (either `+` or `-`).
One or more digits.
A decimal point `.` followed by one or more digits.
An `e` or `E` followed by an integer.
For example, all the following are valid numeric strings:
```
"+"
"-"
"123"
"-123.456"
"1e10"
"-90E3"
```
while the following are not valid numeric strings:
```
"abc"
"1a"
"1e"
"e3"
"99e2.5"
```
You need to write a function that can be used to determine if a given string is a valid numeric string.
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