You can use REGEXMATCH:
=IF(REGEXMATCH(A1, "sites"), 1, 0)
REGEXMATCH returns true if the first argument matches the regular expression given by the second argument. As long as the second argument has no regex special metacharacters (^ $ \ . * + ? ( ) [ ] { } |), this returns true if that argument is a substring of your string.
You can use REGEXMATCH:
=IF(REGEXMATCH(A1, "sites"), 1, 0)
REGEXMATCH returns true if the first argument matches the regular expression given by the second argument. As long as the second argument has no regex special metacharacters (^ $ \ . * + ? ( ) [ ] { } |), this returns true if that argument is a substring of your string.
If you, as Ryan Shillington suggests, want to know the number of cells within a range that has "sites" in it, you might try:
=COUNTIF(A1:A100;"*sites*")
The * acts as a wildcard notion, so it will look for a match anywhere within the cell, not just an exact match for the whole cell.
I've also done this with a cell reference instead of "sites", but then you have to add wildcard-asterixes to the text in the cell.