Identifies the start and end point of the pattern to interest.

Parameter inputs are in the form of `x,y`

where `x`

and `y`

are positive integers indicating the starting character and ending character, respectively, of the pattern of interest.

`x`

must be less than`y`

.- If
`y`

is greater than the length of the value, the pattern is defined to the end of the value, and a match is made.