OpenGrok Help

A Query is a series of clauses. A clause may be prefixed by:

a plus "+" or a minus "-" sign, indicating that the clause is required or prohibited respectively; or
a term followed by a colon ":", indicating the field to be searched. This enables one to construct queries which search multiple fields.

A clause may be either:

a term, indicating all the documents that contain this term; or
a phrase - group of words surrounded by double quotes " ", e.g. "hello dolly"
a nested query, enclosed in parentheses "(" ")" (also called query/field grouping) . Note that this may be used with a +/- prefix to require any of a set of terms.
boolean operators which allow terms to be combined through logic operators. Supported are AND(&&), "+", OR(||), NOT(!) and "-" (Note: they must be ALL CAPS).

Wildcard, Fuzzy, Proximity & Range Searches:

to perform a single character wildcard search use the "?" symbol, e.g. te?t
to perform a multiple character wildcard search use the "*" symbol, e.g. test* or te*t
you cannot use a * or ? symbol as the first character of a search (unless enabled using indexer option -a).
to do a fuzzy search(find words similar in spelling, based on the Levenshtein Distance, or Edit Distance algorithm) use the tilde, "~", e.g. rcs~
to do a proximity search use the tilde, "~", symbol at the end of a Phrase. For example to search for a "opengrok" and "help" within 10 words of each other enter: "opengrok help"~10
range queries allow one to match documents whose field(s) values are between the lower and upper bound specified by the Range Query. Range Queries can be inclusive or exclusive of the upper and lower bounds. Sorting is done lexicographically. Inclusive queries are denoted by square brackets [ ] , exclusive by curly brackets { }. For example: title:{Aida TO Carmen} - will find all documents between Aida to Carmen, exclusive of Aida and Carmen.

Escaping special characters:

Opengrok supports escaping special characters that are part of the query syntax. Current special characters are:
+ - && || ! ( ) { } [ ] ^ " ~ * ? : \
To escape these character use the \ before the character. For example to search for (1+1):2 use the query: $1\+1$\:2

NOTE on analyzers: Indexed words are made up of Alpha-Numeric and Underscore characters. One letter words are usually not indexed as symbols!
Most other characters(including single and double quotes) are treated as "spaces/whitespace"(so even if you escape them, they will not be found, since most analyzers ignore them).
The exceptions are: @ $ % ^ & = ? . : which are mostly indexed as separate words.
Because some of them are part of the query syntax, they must be escaped with a reverse slash as noted above.
So searching for \+1 or \+ 1 will both find +1 and + 1.

valid FIELDs are

                            full: Search through all text tokens(words,strings,identifiers,numbers) in index.
                            defs: Only finds symbol definitions.
                            refs: Only finds symbols.
                            path: path of the source file.
                            hist: History log comments

the term(phrases) can be boosted(making it more relevant) using a caret ^ , e.g. help^4 opengrok - will make term help boosted

Examples:

                    
                            To find where setResourceMonitors is defined:
                            defs:setResourceMonitors
                                
                            To find files that use sprintf in usr/src/cmd/cmd-inet/usr.sbin/:
                            refs:sprintf path:usr/src/cmd/cmd-inet/usr.sbin
                                
                            To find assignments to variable Asign:
                            "Asign="
                                
                            To find Makefiles where pstack binary is being built:
                            pstack path:Makefile
                                
                            to search for phrase "Bill Joy":
                            "Bill Joy"
                                
                            To find perl files that do not use /usr/bin/perl but something else:
                            -"/usr/bin/perl" +"/bin/perl"

                            To find all strings begining with foo use the wildcard:
                            foo*

Opengrok search is powered by lucene, for more detail on query syntax refer to lucene docs.