To specify a term which contains spaces, use single quotes like this: 'term with spaces'

By using a search like fieldname:term, you can search in the following fields:

classifiers

The trove classifiers of a package. Use single quotes to specify a classifier, as they contain spaces: classifiers:'Programming Language :: Python :: 3'

index

The name of the index. This is only the name part, without the user. For example: index:pypi

keywords

The keywords of a package.

name

The package name. For example: name:devpi-client

path

The path of the package in the form '/{user}/{index}/{name}'. For example: path:/root/pypi/devpi-server

type

The type of text. One of project for the project name, title for the title of a documentation page, page for a documentation page, or one of the following project metadata fields: author, author_email, description, keywords, summary. For example: type:page

user

The user name.

End a term with an asterisk to search by prefix like this: path:/fschulze/*

Group query clauses with parentheses.

Use the AND, OR, ANDNOT, ANDMAYBE, and NOT
operators to further refine your search.
Write them in all capital letters, otherwise they will be interpreted as search terms.
An example search would be: devpi ANDNOT client

Boost a term by adding a circumflex followed by the boost value like this: term^2