How to write IF AND regular expression match - regex

Question

I'm trying to write a simple formula for Google Sheets. The logic is as follows:
if(it is a specific date & it is today){fill cell color with this color}
I know this needs to be done in the conditional formatting section but I am unable to get it right.
I've tried:
if(TODAY(),RegExMatch("Tuesday May 2, 2017"))
RegExMatch("Tuesday May 2, 2017") AND IF(TODAY())
IF(TODAY() AND RegExMatch("Tuesday May 2, 2017"))
but none of those work and return errors such as 'parse & invalid' when attempting to write it in the cell box.

Answer 1

REGEXMATCH can be used in Conditional formatting (eg) but it seems way overkill here. Please select the relevant range (I am assuming ColumnA - populated with 'true' dates, not text) and clear any existing CF rules from it. Format, Conditional formatting..., Format cells if... Custom formula is and
=and(A1=today(),A1=42858)
with fill colour of choice and Done.
Here 42858 happens to be the index number for today, but would be replaced with that for your specific date.

Answer 2

Have you tried just getting the value of TODAY()? It returns the date in mm/dd/yyyy format. Your RegExMatch will always fail.
You don't need to use any formula. Use this guide to see how you can use conditional formatting rules on individual or multiple cells. The correct way to do what you want to do is to select a cell, click on Format -> Conditional formatting... -> Format cells if... -> Date is -> today
If you're referring to the cell box in the 'Custom formula' section, you simply need to write =TODAY().

Answer 3

Not sure I'm following exactly, but if your date is in col A:
=AND(DATEVALUE(a1)=datevalue("5/2/2017"),DATEVALUE(a1)=DATEVALUE(today()))
this seems to work. The date has to be parseable to date by sheets for DATEVALUE to work though.
Image has the column in an IF as well setting 1 or 0 just an example of the logic too.