10.10.8 Using regular expressions in search
You can use JavaScript regular expressions in OmniHelp search, by prefixing the search text with a forward slash (/). To learn the arcane syntax required, consult a JavaScript reference.
Note: Omni Systems provides no technical support for this feature.
> 10 Generating OmniHelp > 10.10 Configuring full-text search for OmniHelp > 10.10.8 Using regular expressions in search