Shift-And Bit-Parallel Matching
Track all active pattern prefixes with one bitmask while preserving overlapping matches.
Free theory articleTrack all active pattern prefixes with one bitmask while preserving overlapping matches.
Concept & interpretation
The Shift-And algorithm is a fast string matching technique that uses bitwise operations to process characters. It builds a nondeterministic finite automaton (NFA) where states represent active pattern prefixes.
Experiment
Explore how overlapping matches are preserved in real-time. Follow these steps:
- Open the Shift-And Bit-Parallel Matching module.
- Set Text to
Alternating(which representsababa). - Set Pattern to
aba. - Set Prefix to
Fullto process the entire text. - Observe that the Match count correctly shows 2 matches (at index 0 and 2), tracking multiple prefixes simultaneously.