具有if条件和if then else条件的正则表达式

Question

How can i solve and use this condition in regular Expression if (cond) then s1 else s2. if (cond1)then if (cond) then s1 else s2. please help me

Answer 1

Basically first you give a group a name - for example (?<grp1>match) .

Now we have a group named 'grp1', that matched the word 'match'.

Then we can subsequently probe if this group has matched with (?(R&grp1)yes|no)) which means if grp1 has been matched continue to see if 'yes' now matches otherwise see if 'no' matches.