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File: examples.php

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File: examples.php
Role: Example script
Content type: text/plain
Description: Example script
Class: PHP Regex Builder
Generate regular expression strings from rules
Author: By
Last change:
Date: 5 years ago
Size: 2,135 bytes
 

Contents

Class file image Download
<?php

require_once __DIR__ . '/R.php';

// Full string match
//
// /^Paradise Lost$/
//
echo R::expression()
    ->
startOfString()
    ->
text('Paradise Lost')
    ->
endOfString() . "\n";

// Alternate texts
//
// /The (dog|cat)?basket fell off the roof/
//
echo R::expression()
    ->
text('The ')
    ->
group(
       
R::group()->optional()->oneOfThese()->text('dog')->text('cat')
    )
    ->
text('basket fell off the roof') . "\n";

// Characters
//
// /the [bc]?old man and the [^c]ee.*/
//
echo R::expression()
    ->
text('the ')
    ->
inChars(R::chars('bc')->optional())
    ->
text('old man and the ')
    ->
notInChars(R::chars('c'))
    ->
text('ee')
    ->
char(R::anyChar()->zeroOrMore()) . "\n";

// Nested groups
//
// /(<a href='([^']*)'>)/
echo R::expression()
    ->
group(
       
R::group()
            ->
text("<a href='")
            ->
group(
               
R::group()
                    ->
notInChars(R::chars("'")->zeroOrMore())
            )
            ->
text("'>")
    ) .
"\n";

// Assertions
//
// /\bkettle\b/
//
echo R::expression()
    ->
wordBoundary()
    ->
text('kettle')
    ->
wordBoundary() . "\n";

// Quantifiers: Dutch postal code
//
// /[\d]{4}[a-z]{2}/
//
echo R::expression()
    ->
char(R::chars()->digit()->times(4))
    ->
char(R::chars()->letter()->times(2)) . "\n";

// Named blocks
// Automatically adjusting delimiters (#)
//
// #(?P<protocol>http[s]?)://(?P<url>.*)#
//
echo R::expression()
    ->
group(
       
R::group('protocol')
            ->
text('http')
            ->
char(R::chars('s')->optional())
    )
    ->
text('://')
    ->
group(
       
R::group('url')
            ->
char(R::anyChar()->zeroOrMore())
    ) .
"\n";

// Multiline expressions
//
// /^start\s+(^the)\s+show$/m
//
echo R::multiLineExpression()
    ->
startOfStringOrLine()
    ->
text('start')
    ->
whitespace()
    ->
group(
       
R::group()->startOfLine()->text('the')
    )
    ->
whitespace()
    ->
text('show')
    ->
endOfStringOrLine() . "\n";

// Look ahead, look behind
//
// /(?<=Lord )(Byron)/
//
echo R::expression()
    ->
lookBehind(
       
R::lookBehind()->text('Lord ')
    )
    ->
group(
       
R::group()->text('Byron')
    ) .
"\n";

// Include raw expressions
//
// #(?P<protocol>https?)://(?P<url>.*)#
//
echo R::expression()
    ->
group(
       
R::group('protocol')->raw('https?')
    )
    ->
text('://')
    ->
group(
       
R::group('url')->raw('.*')
    ) .
"\n";

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