PHP code example of hoa / regex

1. Go to this page and download the library: Download hoa/regex library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

hoa / regex example snippets


// 1. Read the grammar.
$grammar  = new Hoa\File\Read('hoa://Library/Regex/Grammar.pp');

// 2. Load the compiler.
$compiler = Hoa\Compiler\Llk\Llk::load($grammar);

// 3. Lex, parse and produce the AST.
$ast      = $compiler->parse('ab(c|d){2,4}e?');

// 4. Dump the result.
$dump     = new Hoa\Compiler\Visitor\Dump();
echo $dump->visit($ast);

/**
 * Will output:
 *     >  #expression
 *     >  >  #concatenation
 *     >  >  >  token(literal, a)
 *     >  >  >  token(literal, b)
 *     >  >  >  #quantification
 *     >  >  >  >  #alternation
 *     >  >  >  >  >  token(literal, c)
 *     >  >  >  >  >  token(literal, d)
 *     >  >  >  >  token(n_to_m, {2,4})
 *     >  >  >  #quantification
 *     >  >  >  >  token(literal, e)
 *     >  >  >  >  token(zero_or_one, ?)
 */


$generator = new Hoa\Regex\Visitor\Isotropic(new Hoa\Math\Sampler\Random());
echo $generator->visit($ast);

/**
 * Could output:
 *     abdcde
 */