> ## Documentation Index > Fetch the complete documentation index at: https://labs.laer.ai/llms.txt > Use this file to discover all available pages before exploring further. # Lucene Epiq AI supports Lucene syntax for keyword search. ### Query examples | Query | Search string | Description | | ---------------------- | ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | **Single word** | foo | ​ | | **Phrase** | "foo bar" | ​ | | **AND, OR, NOT** | foo AND bar, foo OR bar, foo NOT bar | The "NOT" operator excludes documents that contain the term after NOT. It cannot be used with just one term, for example, NOT foo will not work. | | **Wildcard search** | foo\*, foo\*bar, foo?, foo?bar | "?" is used for single character wildcard search; "\*" is used for multiple character wildcard search. "\*" and "?" cannot be used as the first character of a search. | | **Fuzzy search** | foo\~, foo\~0.8 | Use "\~" at the end of a single word term to search for a similar term based on string similarity. You can specify the similarity value between 0 and 1 with a higher value indicating higher similarity. | | **Proximity search** | "foo bar"\~10 | Use "\~" at the end of a phrase like "foo bar"\~10 to search for a "foo" and "bar" within 10 words of each other in a document. Note that the proximity search in Lucene is ordered, i.e., the terms will be matched in exact order. | | **Regular expression** | /\d+/ | Wrap regex inside `/` and `/` | ### **Regular expressions** | Query | Regular Expression | Match results | | ---------------------- | -------------------------------------------- | ------------------------------------------- | | Social security number | /\d\{3}-\d\{2}-\d\{4}/ | 010-00-1234 | | Dates | /\[0-9]\{2}/\[0-9]\{2}/\[0-9]\{2,4}/ | 09/27/2000 | | Phone numbers | /(\[0-9]\{3}-)?\[0-9]\{3}-\[0-9]\{4}/ | 301-280-6231 | | Email addresses | /(\[\w\_.]+)\\@(\[\w\_.]+).(\[\w\_.]\{2,6})/ | [abc.123@test.com](mailto:abc.123@test.com) |