Matching with Greedy vs. Nongreedy Expressions : Regular Expressions « String « PHP

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PHP » String » Regular Expressions

Matching with Greedy vs. Nongreedy Expressions


 

<?php 

$teststring = '"Hello" and "Goodbye."'; 

$greedyresult = preg_replace('/".*"/', '"***"', $teststring); 

$nongreedyresult = preg_replace('/".*?"/', '"***"', $teststring); 



echo "Original: $teststring\n"; 



echo "Greedy Replace: $greedyresult\n"; 



echo "Nongreedy Replace: $nongreedyresult\n"; 

?>

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16.	Define a pattern and use parentheses to match individual elements within it
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18.	Greedy and non-greedy matching
19.	Greedy versus nongreedy matching
20.	Grouping captured subpatterns
21.	Validating Pascal Case Names
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26.	POSIX Regular Expressions Character Classes
27.	Ranges
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29.	Predefined Character Ranges (Character Classes)
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31.	Pattern match extenders:
32.	Perl-Compatible Regular Expressions (PCRE)
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37.	Regular expressions using character classes

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