Regex for ^ (the caret symbol)?

I am trying to search for string that includes the caret symbol, using the
following code:
grepl("latitude^2",temp)

Many regex implementations require us to escape a metacharacter such as
'^' by preceeding it with a backslash. This indicates the next character is
a literal and not, in this case, the beginning of the line. Try \^ in your
statement.

Rich