Line Number Filter is to limit the replace scope to the specified No. of matched line pattern.
For example, if "Line Pattern Filter" is "ABC", "Line Number Filter" is 2, then the replace scope will be limited to only the 2nd line contain "ABC".
See Range Definition for detail.
How does system decide the No. of each matched line:
1. If Replace Scope is "Line", the first matched line will be No. 1, the second will be No.2, and so on.
1. If Replace Scope is "Line of Paragraph", the first matched line within each paragraph will be No. 1, the second will be No.2, and so on.