Conditional Formatting to cells that contain certain formula in Google Sheets

I want to highlight with conditional formatting the cells that contain ARRAYFORMULA (just the formula cell, not the whole array). How could be done?

>Solution :

to highlight formula you can use

=ISFORMULA(A1)

to highlight only arrayformula formulas you can do:

=REGEXMATCH(FORMULATEXT(A1); "(?i)arrayformula")

Edit: But first set apply to range to: 1:1000