8.8 Easter eggs

• Starting with version 3.0 of the Corpus Workbench, CQP comes with a built-in regular expression optimiser; this optimiser detects simple regular expressions commonly used for prefix, suffix or infix searches such as

  > "under.+";
> ".+ment";
> ".+time.+";

  and replaces the normal regexp evaluation with a highly efficient Boyer-Moore search algorithm.

• the optimiser will also recognise some slightly more complex regular expressions; if you want to test whether a given expression can be optimised or not, switch on debugging output with

  > set CLDebug on;

• Some beta releases of CQP may contain hidden optimisations and/or other features that are disabled by default because they have not been tested thoroughly; such hidden features will usually be documented in the release notes and can be activated with the option

  > set Optimize on;

• The official LTS releases v3.0 and v3.5 of CQP have no hidden features.