Retrieve match n.
n==0 means the matched substring, n>0 means the n'th parenthesized subexpression. if n is larger than the number of parenthesized subexpressions, null is returned.
See Implementation
Retrieve match n.
n==0 means the matched substring, n>0 means the n'th parenthesized subexpression. if n is larger than the number of parenthesized subexpressions, null is returned.