OpenGrok 搜索用法

部署安装OpenGrok {O之后需要使用——

• 主页的Help按钮包含了基础的使用方法
• 官方API调用说明文档:opengrop API on apiary(Powerful API Design Stack. Built for Developers)
• openGrok底层使用lucene，支持的正则表达式参考Lucene regexp page

搜索引擎对比——

23 Google Search Tips You'll Want to Learn
https://www.google.com/advanced_search
https://www.google.com/advanced_image_search
搜索操作符支持，类似的google支持的Search operators

• Full Search (full) Search through all text tokens (words,strings,identifiers,numbers) in index.
• Definition (defs) Only finds symbol definitions (where e.g. a variable (function, ...) is defined).
• Symbol (refs) Only finds symbols (e.g. methods, classes, functions, variables).
• File Path (path) path of the source file (no need to use dividers, or if, then use "/" - Windows users, "" is an escape key in Lucene query syntax!
  Please don't use "", or replace it with "/").
  Also note that if you want just exact path, enclose it in "", e.g. "src/mypath", otherwise dividers will be removed and you get more hits.
• History (hist) History log comments.

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).

Regular Expression, Wildcard, Fuzzy, Proximity & Range Searches:

• to perform a regular expression search use the "/" enclosure, e.g. /[mb]an/ - will search for man or for ban;
  NOTE: path field search escapes "/" by default, so it only supports regexps when the search string <u>starts and ends</u> with "/".
  More info can be found on Lucene regexp page.
• 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 can use a * or ? symbol as the first character of a search (unless not 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.