3 new find & replace options

[mattpass]

There are 3 common find and replace options that are often useful which we should look to implement:

• "Match Case" - checkbox option
• "Whole Word" checkbox option
• "Regex" checkbox option

Could change the regex icon to the left of the find box to a cog, which indicates settings and when clicked on shows a small modal including these 3 options, so they're tucked out of view till you display them.