# Regular Expression Helper

**Tier:** 2-Intermediate

Regular Expressions should be a valuable part of any developers toolbox. They
provide a concise way to describe a pattern that can be used to test, search, 
match, replace, or split the contents of a 
string. Regular Expressions provide functionality you might otherwise have to
implement using loops and more lines of code.

The Regular Expression Helper helps you learn more about Regular Expressions
by building a useful tool you'll also be able to use to test expressions
you use in your apps.

## User Stories

-   [ ] User can enter a regular expression.
-   [ ] User can enter a string the regular expression can be run against.
-   [ ] User can click a 'Run' button to test
-   [ ] User can see a warning message if no regular expression was entered.
-   [ ] User can see a warning message if no string was entered.
-   [ ] User can see the matching text highlighted indicating if `test()` was able to locate the pattern in the string.
-   [ ] User can see a message if none of the text was matched.

## Bonus features

-   [ ] User can select the flags (like 'g') to be used in the regular expression from a dropdown - global, case insensitive, multiline, sticky.
-   [ ] User can select the RegExp function to be applied from a dropdown - test, search, or match
-   [ ] User can see a message indicating the result of the selected RegExp function.
-   [ ] Developer can run automated tests using a testing framework such as
[Jest](https://jestjs.io/)

## Useful links and resources

- [Javascript RegExp](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
- [Regular Expressions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions)

## Example projects

- [RegExr](https://regexr.com/)
- [Regular Expressions 101](https://regex101.com/)