AActivity diagram used in UML 6/9 and SysMLBBachman diagramBooch used in software engineeringBlock diagramBlock Definition Diagram BDD used in SysMLCCarroll diagramCartogramCatalytic cycleChemical equationCurly arrow diagramCategory theory diagramsCause-and-effect diagramChord diagramCircuit diagramClass diagram from UML 1/9Collaboration diagram from UML 2.0Communication diagram from UML 2.0Commutative diagramComparison diagramComponent diagram from UML 3/9Composite structure diagram from UML 2.0Concept mapConstellation diagramContext diagramControl flow diagramContour diagramCordier diagramCross functional flowchartDData model diagramData flow diagramData structure diagramDendrogramDependency diagramDeployment diagram from UML 9/9Dot and cross diagramDouble bubble map used in educationDrakon-chartEEntity-Relationship diagram ERD Event-driven process chainEuler diagramEye diagram a diagram of a received telecommunications signalExpress-GExtended Functional Flow Block Diagram EFFBD FFamily treeFeynman diagramFlow chartFlow process chartFlow diagramFusion diagramFree body diagramGGantt chart shows the timing of tasks or activities used in project management Grotrian diagramGoodman diagram shows the fatigue data example: for a wind turbine blades HHasse diagramHIPO diagramIInternal Block Diagram IBD used in SysMLIDEF0IDEF1 entity relations Interaction overview diagram from UMLIshikawa diagramJJackson diagramKKarnaugh mapKinematic diagramLLadder diagramLine of balanceLink grammar diagramMMartin ERDMessage Sequence ChartMind map used for learning, brainstorming, memory, visual thinking and problem solvingMinkowski spacetime diagramMolecular orbital diagramNN2Nassi Shneiderman diagram or structogram a representation for structured programmingNomogramNetwork diagramOObject diagram from UML 2/9OrganigramOnion diagram also known as 'stacked Venn diagram'PPackage diagram from UML 4/9 and SysMLParametric diagram from SysMLPERTPetri net shows the structure of a distributed system as a directed bipartite graph with annotationsPhylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas informationPlant DiagramPressure volume diagram used to analyse enginesPourbaix diagramProcess flow diagram or PFD used in chemical engineeringProgram structure diagramRRadar chartRadial DiagramRequirement Diagram Used in SysMLRich PictureR-diagramRouting diagramSSankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network.Sentence diagram represents the grammatical structure of a natural language sentence.Sequence diagram from UML 8/9 and SysMLSDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science.Smith chartSpider chartSpray diagramSSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphereState diagram are used for state machines in software engineering from UML 7/9Swim laneSyntax diagram used in software engineering to represent a context-free grammarSystems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biologySystem context diagramSystem structureSystematic layout planningTTiming Diagram: Digital Timing DiagramTiming Diagram: UML 2.0TQM DiagramTreemapUUML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysMLVValue Stream MappingVenn diagramVoronoi diagramWWarnier-OrrWilliot diagramYYourdon-Coad see Edward Yourdon, used in software engineering
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Released:
pyahocorasick is a fast and memory efficient library for exact or approximate multi-pattern string search. With the ahocorasick.Automaton class, you can find multiple key strings occurrences at once in some input text. You can use it as a plain dict-like Trie or convert a Trie to an automaton for efficient Aho-Corasick search. Implemented in C and tested on Python 2.7 and 3.4+. Works on Linux, Mac and Windows. BSD-3-clause license.
pyahocorasick is a fast and memory efficient library for exact or approximatemulti-pattern string search meaning that you can find multiple key stringsoccurrences at once in some input text. The library provides an ahocorasick Pythonmodule that you can use as a plain dict-like Trie or convert a Trie to an automatonfor efficient Aho-Corasick search.
It is implemented in C and tested on Python 2.7 and 3.4+. It works on Linux, Mac andWindows.
The license is BSD-3-clause. Some utilities, such as tests and the pure Pythonautomaton are dedicated to the Public Domain.
This module is written in C. You need a C compiler installed to compile nativeCPython extensions. To install:
Then create an Automaton:
You can use the Automaton class as a trie. Add some string keys and their associatedvalue to this trie. Here we associate a tuple of (insertion index, original string)as a value to each key string we add to the trie:
Then check if some string exists in the trie:
And play with the get() dict-like method:
Now convert the trie to an Aho-Corasick automaton to enable Aho-Corasick search:
Then search all occurrences of the keys (the needles) in an input string (our haystack).
Here we print the results and just check that they are correct. TheAutomaton.iter() method return the results as two-tuples of the end index where atrie key was found in the input string and the associated value for this key. Herewe had stored as values a tuple with the original string and its trie insertionorder:
You can also create an eventually large automaton ahead of time and pickle it tore-load later. Here we just pickle to a string. You would typically pickle to afile instead:
The full documentation including the API overview and reference is published onreadthedocs.
With an Aho-Corasick automatonyou can efficiently search all occurrences of multiple strings (the needles) in aninput string (the haystack) making a single pass over the input string. Withpyahocorasick you can eventually build large automatons and pickle them to reusethem over and over as an indexed structure for fast multi pattern string matching.
One of the advantages of an Aho-Corasick automaton is that the typical worst-caseand best-case runtimes are about the same and depends primarily on the sizeof the input string and secondarily on the number of matches returned. Whilethis may not be the fastest string search algorithm in all cases, it can searchfor multiple strings at once and its runtime guarantees make it rather unique.Because pyahocorasick is based on a Trie, it stores redundant keys prefixes onlyonce using memory efficiently.
A drawback is that it needs to be constructed and “finalized” ahead of timebefore you can search strings. In several applications where you search for severalpre-defined “needles” in a variable “haystacks” this is actually an advantage.
Aho-Corasick automatons are commonly used for fast multi-pattern matchingin intrusion detection systems (such as snort), anti-viruses and many otherapplications that need fast matching against a pre-defined set of string keys.
Internally an Aho-Corasick automaton is typically based on a Trie with extradata for failure links and an implementation of the Aho-Corasick searchprocedure.
Behind the scenes the pyahocorasick Python library implements these two datastructures: a Trie and an Aho-Corasick stringmatching automaton. Both are exposed through the Automaton class.
In addition to Trie-like and Aho-Corasick methods and data structures,pyahocorasick also implements dict-like methods: The pyahocorasickAutomaton is a Trie a dict-like structure indexed by string keys eachassociated with a value object. You can use this to retrieve an associated valuein a time proportional to a string key length.
pyahocorasick is available in two flavors:
The type of strings accepted and returned by Automaton methods are eitherunicode or bytes, depending on a compile time settings (preprocessordefinition of AHOCORASICK_UNICODE as set in setup.py).
The Automaton.unicode attributes can tell you how the library was built.On Python 3, unicode is the default. On Python 2, bytes is the default and only value.
Warning
When the library is built with unicode support on Python 3, an Automaton willstore 2 or 4 bytes per letter, depending on your Python installation. When builtfor bytes, only one byte per letter is needed.
Unicode is NOT supported on Python 2 for now.
To install for common operating systems, use pip. Pre-built wheels should beavailable on Pypi at some point in the future:
To build from sources you need to have a C compiler installed and configured whichshould be standard on Linux and easy to get on MacOSX.
On Windows and Python 2.7 you need the Microsoft Visual C++ Compiler for Python 2.7 (aka. VisualStudio 2008). There have been reports that pyahocorasick does not build yet withMinGW. It may build with cygwin but this has not been tested. If you get this workingwith these platforms, please report in a ticket!
To build from sources, clone the git repository or download and extract the sourcearchive.
Install pip (and its setuptools companion) and then run (in a virtualenv ofcourse!):
If compilation succeeds, the module is ready to use.
Support is available through the GitHub issue tracker to report bugs or askquestions.
You can submit contributions through GitHub pull requests.
The initial author and maintainer is Wojciech Muła. Philippe Ombredanne, the current co-owner, rewrotedocumentation, setup CI servers and did a whole lot of work to make this modulebetter accessible to end users.
Alphabetic list of authors:
This library would not be possible without help of many people, who contributed invarious ways.They created pull requests,reported bugs as GitHub issuesor via direct messages, proposed fixes, or spent their valuable time on testing.
Thank you.
This library is licensed under very liberalBSD-3-Clause license. Some portions ofthe code are dedicated to the public domain such as the pure Python automaton and testcode.
Full text of license is available in LICENSE file.
While pyahocorasick tries to be the finest and fastest Aho Corasick libraryfor Python you may consider these other libraries:
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