C++ regular expressions made easy

Related tags

Regular Expression CppVerbalExpressions
Overview

CppVerbalExpressions

C++ Regular Expressions made easy

VerbalExpressions is a C++11 Header library that helps to construct difficult regular expressions.

This C++ lib is based off of the (original) Javascript VerbalExpressions library by jehna.

Other Implementations

You can see an up to date list of all ports on VerbalExpressions.github.io.

How to get started

In case you do not have C++11 compliant standard library you can still use boost.regex.

Examples

Here's a couple of simple examples to give an idea of how VerbalExpressions works:

Testing if we have a valid URL

// Create an example of how to test for correctly formed URLs
verex expr = verex()
            .search_one_line()
            .start_of_line()
            .then( "http" )
            .maybe( "s" )
            .then( "://" )
            .maybe( "www." )
            .anything_but( " " )
            .end_of_line();

// Use verex's test() function to find if it matches
std::cout << expr.test("https://www.google.com") << std::endl;

// Ouputs the actual expression used: ^(?:http)(?:s)?(?:://)(?:www.)?(?:[^ ]*)$
std::cout << expr << std::endl;

Replacing strings

// Create a test string
std::string replaceMe = "Replace bird with a duck";
// Create an expression that seeks for word "bird"
verex expr2 = verex().find("bird");
// Execute the expression
std::cout << expr2.replace(replaceMe, "duck") << std::endl;

Shorthand for string replace:

std::cout << verex().find( "red" ).replace( "We have a red house", "blue" ) << std::endl;

Here you can find the API documentation for Verbal Expressions

Basic usage

Basic usage of Verbal Expressions starts from the expression verex(). You can chain methods afterwards. Those are described under the "terms" section.

auto expr = verex();

API

Terms

  • .anything()
  • .anything_but( const std::string & value )
  • .something()
  • .something_but(const std::string & value)
  • .end_of_line()
  • .find( const std::string & value )
  • .maybe( const std::string & value )
  • .start_of_line()
  • .then( const std::string & value )

Special characters and groups

  • .any( const std::string & value )
  • .any_of( const std::string & value )
  • .br()
  • .linebreak()
  • .range( const std::vector<std::pair<std::string, std::string>> & args )
  • .range( const std::std::string & a, const & std::string b )
  • .tab()
  • .word()

Modifiers

  • .with_any_case()
  • .search_one_line()
  • .search_global()

Functions

  • .replace( const std::string & source, const std::string & value )
  • .test()

Other

  • .add( expression )
  • .multiple( const std::string & value )
  • .alt()
Comments
  • What does this error mean?

    What does this error mean?

    i have finished installing boost library, running cmake and make, but when i run CppVerbalExpressionsExample, i got following error:

    terminate called after throwing an instance of 'std::regex_error' what(): regex_error Aborted

    opened by lqniunjunlper 3
  • It's just wrong to call it Singleton.

    It's just wrong to call it Singleton.

    I somewhat raged at the whole 'verbal expressions' thing and all that hype about it. I do not understand why you all make regexp even worse.

    Anyway let's be right about few things in this port.

    First of all C++11 support for regexps is good. Only few standard libraries do not implement this. But I can argue with this as for now. Also, you are calling "VerbEx()" a singleton which is not true. This is just object instantiation and all that verbal expression magic is just a method chaining through returning reference to this.

    Please consider merging my fixes as I think many novice programmers could see this C++ port (through reading Verbal Expressions written in JavaScript through hackernews or something like that) and learn wrong about important aspects of this language.

    Thanks.

    opened by mpapierski 1
  • Fix broken headings in Markdown files

    Fix broken headings in Markdown files

    GitHub changed the way Markdown headings are parsed, so this change fixes it.

    See bryant1410/readmesfix for more information.

    Tackles bryant1410/readmesfix#1

    opened by bryant1410 0
  • Fixed C4458 warning on line 162 due to source having same name

    Fixed C4458 warning on line 162 due to source having same name

    Hi, Thanks for this class, it's been very useful.

    This PR fixes a C4458 warning on line 162 because it receives a "source" and has a class member var with same name. Personally I usually go with _ but in this case renaming it to src was the least distruptive change, I hope that's ok.

    Also made a few functions const and replaced a couple string::find with the char equivalent.

    image

    Thanks.

    opened by DJLink 0
  • Conan package

    Conan package

    Hello, Do you know about Conan? Conan is modern dependency manager for C++. And will be great if your library will be available via package manager for other developers.

    Here you can find example, how you can create package for the library.

    If you have any questions, just ask :-)

    opened by zamazan4ik 1
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