HP gnu source-level debugger 5992-4701 - Manual (Page 197)

+length Specifies the length of the memory address range. This
parameter is mandatory when end-address is not
specified.
expr1, expr2, .... Specifies a variable or pattern to be searched. The pattern
can be a variable, hexadecimal character, a character, or
a string value. The character pattern must be enclosed
within single quotes. The string pattern must be enclosed
within double quotes. This parameter is mandatory.
The $numfound variable contains the number of patterns matched within the given
memory address range.
14.14 Command to Search for a Pattern in the Memory Address Space 197