Advanced queries

RNAcentral search supports advanced query syntax that makes it easy to compose very precise queries. You can find examples and documentation in the RNAcentral help centre, but here is a quick review of some advanced search features.

lightbulb iconTip: Don't worry about remembering the syntax - you can always look it up on any search results page or in RNAcentral help (Figure 21).

advanced query syntax help

Figure 21 How to find the query syntax in RNAcentral.

Field-specific searches

When you type a simple query in the search box, it will match all entries that contain that word anywhere in that entry.

For example, if you type "Vega" in the query box when trying to find sequences from the Vega Expert Database, you will also find sequences from publications authored by people whose last name is Vega

To perform a more specific search, you can either use facets or rewrite your query like this: expert_db:"Vega", which means that you are only interested in the field called expert_db. This search will match only sequences from the Vega Expert Database.

Field-specific searches have the following format: field_name:"query term"

Note that the query term is surrounded by quotation marks.

You can also run field-specific searches for:

  • NCBI Taxonomy identifiers;

  • common species names (for example, mouse, cow etc);

  • ncRNA type (rRNA, tRNA, snoRNA etc);

  • gene name (HOTAIR, TSIX etc);

  • sequence length;

  • publication metadata: author, paper title, PubMed identifiers, DOI;

  • and more!

Logical operators

Keywords can be grouped with parentheses and connected with AND, OR, and NOT logical operators to express relations between query terms.

info iconBy default, all keywords are joined using the AND operator, even if you don't type it.

For example, if you would like to download sequences from PDB structures 4V4Q and 1S72, you can search for 4V4Q or 1S72 and get sequences from both 3D structures.

Note that a search for 4V4Q and 1S72 won't find any results because these 3D structures don't have any sequences in common.