updated index.html made regex Find field required. Moved textarea checkbox to after modifiers. Renamed test and replace button IDs to submitTest and submitReplace respectively and renamed textarea checkbox[x] to makeTextarea[x] to better clarify their function
updated regex.js. Added numerous commments. Added function getFindReplaceInput() to handle getting regex Find/Replace fields (regardless of whether they are <input>s or <textarea>s. Updated textareaClick() to make use of getFindReplaceInput(). Switched the order of makeTextarea and modifiers fields for each regex Find/Replace pair. Added more detail to testRegex() so it now doesn't kill the script (but still doesn't do what it is supposed to do)