Syntax error test cases for JSON Pointer (JP) and Relative JSON Pointer (RJP)

json-pointer-errors.txt

Malformed ptr   Notes
=====================
"0"             valid RJP
"1-4#"          valid RJP
"0+20/foo/bar   valid RJP
"foo/bar"       missing initial "/"
"/foo~/bar"     unescaped "~"

relative-json-pointer-errors.txt

Note that several of these catch likely regular expression errors,
such as improper grouping of terms or incorrectly handling 0.

Malformed rel ptr   Notes
=========================
"/foo/bar"          valid JP
"0+"                missing index adjusmtent number
"-2/foo/bar"        missing parent adjustment
"0+0"               0 index adjusmtent not allowed (0 plus)
"0-0"               0 index adjustment not allowed (0 minus)
"1+0/foo"           0 index adjustment not allowed (non-0 plus)
"4-0#"              0 index adjustment not allowed (non-0 minus)
"0+A"               non-numeric index adjustment
"*+1#"              non-numeric parent adjustment
"2foo/bar"          missing leading "/" for pointer
"1#/foo/bar"        index name and pointer together