diff options
Diffstat (limited to 'HACKING')
| -rw-r--r-- | HACKING | 7 |
1 files changed, 6 insertions, 1 deletions
@@ -210,7 +210,8 @@ These items are all just one unit long OP_THEN ) OP_ASSERT_ACCEPT is used when (*ACCEPT) is encountered within an assertion. -This ends the assertion, not the entire pattern match. +This ends the assertion, not the entire pattern match. The assertion (?!) is +always optimized to OP_FAIL. Backtracking control verbs with optional data @@ -528,6 +529,10 @@ immediately before the assertion. It is also possible to insert a manual callout at this point. Only assertion conditions may have callouts preceding the condition. +A condition that is the negative assertion (?!) is optimized to OP_FAIL in all +parts of the pattern, so this is another opcode that may appear as a condition. +It is treated the same as OP_FALSE. + Recursion --------- |