add and modify the non-greedy

[CuiZewen]

In the past, there is only greedy quantifiers(.) , so i add the lazy quantifiers(.?)

The first tries first to repeat then backtracks to following pattern, the second tries first the following pattern then backtracks to repeat.

for example on the string "abab"
a.b will match "abab", a.?b will match only the starting "ab" :)