This project contains the source code of a tool for generating regular expressions for text extraction and classification (flagging):
- automatically,
- based only on examples of the desired behavior,
- without any external hint about how the target regex should look like.
An online, interactive version of this engine is accessible at: http://regex.inginf.units.it/
RegexGenerator was developed at the [Machine Learning Lab, University of Trieste, Italy] (http://machinelearning.inginf.units.it).
The provided engine is a developement release (1) that implements the algorithms published in our articles (2):
Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript. Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript Regular Reg Expressions Ex 101.
- Bartoli, De Lorenzo, Medvet, Tarlao, Inference of Regular Expressions for Text Extraction from Examples, IEEE Transactions on Knowledge and Data Engineering, 2016
- Bartoli, De Lorenzo, Medvet, Tarlao, Can a machine replace humans in building regular expressions? A case study, IEEE Intelligent Systems, 2016
- Bartoli, De Lorenzo, Medvet, Tarlao, Virgolin, Evolutionary Learning of Syntax Patterns for Genic Interaction Extraction, ACM Genetic and Evolutionary Computation Conference (GECCO), 2015, Madrid (Spain)
More details about the project can be found on Machine Learning Lab news pages.
Regex Enter Key
- Re2c - 'regular expression to C' says it's about generating lexers: re2c is a lexer generator for C/C. Its key features are: Very fast lexers: the generated code is as good as a carefully tuned hand-crafted C/C lexer. It’s because re2c generates minimalistic hard-coded state machine (as opposed to full-featured table-based lexers).
- Nov 21, 2018 The best we can hope for is to generate numbers and strings that don't seem to follow a pattern and can't be practically predicted by an attacker. In this tutorial, we will cover different techniques for generating random numbers and alphanumeric strings in PHP.
We hope that you find this code instructive and useful for your research or study activity.
If you use our code in your reasearch please cite our work and please share back your enhancements, fixes andmodifications.
Project Structure
The RegexGenerator project is organized in three NetBeans Java subprojects:
- ConsoleRegexTurtle: cli frontend for the GP engine
- MaleRegexTurtle: provides the regular expression tree representation
- Random Regex Turtle: GP search engine
Other Links
Twitter account of Machine Learning Lab
RegexGenerator wiki with installation walkthrough and guide
(1) This is a developement version branch which slightly differs from the cited works.
(2) BibTeX format:
-->Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data. The IV does not have to be secret, but should be changed for each session. Asymmetric algorithms require the creation of a public key and a private key. The public key can be made public to anyone, while the private key must known only by the party who will decrypt the data encrypted with the public key. This section describes how to generate and manage keys for both symmetric and asymmetric algorithms.
Symmetric Keys
The symmetric encryption classes supplied by the .NET Framework require a key and a new initialization vector (IV) to encrypt and decrypt data. Whenever you create a new instance of one of the managed symmetric cryptographic classes using the parameterless constructor, a new key and IV are automatically created. Anyone that you allow to decrypt your data must possess the same key and IV and use the same algorithm. Generally, a new key and IV should be created for every session, and neither the key nor IV should be stored for use in a later session.
To communicate a symmetric key and IV to a remote party, you would usually encrypt the symmetric key by using asymmetric encryption. Sending the key across an insecure network without encrypting it is unsafe, because anyone who intercepts the key and IV can then decrypt your data. For more information about exchanging data by using encryption, see Creating a Cryptographic Scheme.
The following example shows the creation of a new instance of the TripleDESCryptoServiceProvider class that implements the TripleDES algorithm.
When the previous code is executed, a new key and IV are generated and placed in the Key and IV properties, respectively.
Sometimes you might need to generate multiple keys. In this situation, you can create a new instance of a class that implements a symmetric algorithm and then create a new key and IV by calling the GenerateKey and GenerateIV methods. The following code example illustrates how to create new keys and IVs after a new instance of the symmetric cryptographic class has been made.
When the previous code is executed, a key and IV are generated when the new instance of TripleDESCryptoServiceProvider is made. Another key and IV are created when the GenerateKey and GenerateIV methods are called.
Asymmetric Keys
The .NET Framework provides the RSACryptoServiceProvider and DSACryptoServiceProvider classes for asymmetric encryption. These classes create a public/private key pair when you use the parameterless constructor to create a new instance. Asymmetric keys can be either stored for use in multiple sessions or generated for one session only. While the public key can be made generally available, the private key should be closely guarded.
A public/private key pair is generated whenever a new instance of an asymmetric algorithm class is created. After a new instance of the class is created, the key information can be extracted using one of two methods:
The ToXmlString method, which returns an XML representation of the key information.
The ExportParameters method, which returns an RSAParameters structure that holds the key information.
Both methods accept a Boolean value that indicates whether to return only the public key information or to return both the public-key and the private-key information. An RSACryptoServiceProvider class can be initialized to the value of an RSAParameters structure by using the ImportParameters method.
Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more on how to store a private key in a key container, see How to: Store Asymmetric Keys in a Key Container.
Generate dlp bypass client key. The following code example creates a new instance of the RSACryptoServiceProvider class, creating a public/private key pair, and saves the public key information to an RSAParameters structure.