Try to solve this at https://algodaily.com/challenges/valid-numeric-string 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.