In the case of Open Text regular expressions are also allowed. Some services also offer weighting of search strings. Excite weights a term according to frequency of appearance in the search request. With Open Text the weighting value can be given. Excite also offers a concept search which uses a thesaurus so that the search term doesn't necessarily have to appear in a document.
Some search engines offer various search modes.
Additionally, Open Text offers weighted searching as the distinction. Most search engines support Boolean operators. The better ones even allow them with brackets, others on the other hand without a mixture. Limiting the search area Some search services offer various limitations on the search area. Spacing operators and word order are supported in various ways.