Build a RegEx Sandbox

For this lab, you start with the CSS and HTML already written for you. You will use JavaScript to enable the regex sandbox to test a regular expression against a string and highlight the results. **Objective:** Fulfill the user stories below and get all the tests to pass to complete the lab. **User Stories:** 1. You should access the `#pattern`, `#test-string`, `#test-btn`, and `#result` elements and save them in the variables `regexPattern`, `stringToTest`, `testButton`, and `testResult`, respectively. 1. You should access the `#i` and `#g` flag checkboxes and save them in the variables `caseInsensitiveFlag` and `globalFlag`, respectively. 1. You should have a function named `getFlags` that returns a string containing the flags from checked flag checkboxes, or an empty string if none of them have been checked. 1. When you click the `testButton` button, if the regex pattern matches the test string, the matched text should be highlighted. To highlight the matches, update `stringToTest`'s `innerHTML` so that each match is replaced with the same text surrounded by a `span` element with the class of `highlight`. Note that the CSS for that has been already added for you. 1. When there's a match, the matched text should be displayed inside `#result`. In case of multiple matches, each matched text should be separated from the next one by a comma and a space. 1. When there's no match, the text `no match` should be displayed inside `#result`.