Matching using backreferences : Regular Expressions « String « PHP

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PHP » String » Regular Expressions

Matching using backreferences


 

<?

$ok_html  = "I <b>love</b> shrimp dumplings.";



if (preg_match('@<[bi]>.*?</[bi]>@',$ok_html)) {

    print "Good for you! (OK, No backreferences)\n";

}

if (preg_match('@<([bi])>.*?</\\1>@',$ok_html)) {

    print "Good for you! (OK, Backreferences)\n";

}

?>

Related examples in the same category

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2.	Character Classes
3.	Complete list of regular expression examples
4.	\b and \B, equate to "On a word boundary" and "Not on a word boundary," respectively.
5.	^ and $ are line anchors.
6.	Line Anchors
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8.	Match an IP address
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11.	Matching a Valid E-mail Address
12.	Matching a Valid IP Address
13.	Matching with Greedy vs. Nongreedy Expressions
14.	Matching with character classes and anchors
15.	Matching with \|
16.	Define a pattern and use parentheses to match individual elements within it
17.	Greedy Qualifiers
18.	Greedy and non-greedy matching
19.	Greedy versus nongreedy matching
20.	Grouping captured subpatterns
21.	Validating Pascal Case Names
22.	Validating U.S. Currency
23.	Validating a credit card number
24.	Nongreedy Qualifiers
25.	POSIX Regular Expressions Character Classes
26.	POSIX Regular Expressions Character Classes
27.	Ranges
28.	Option patterns:
29.	Predefined Character Ranges (Character Classes)
30.	Pattern matches:
31.	Pattern match extenders:
32.	Perl-Compatible Regular Expressions (PCRE)
33.	Qualifiers restrict the number of times the preceding expression may appear.
34.	Quantifiers for Matching a Recurring Character
35.	Quantifiers: +, *, ?, {int. range}, and $ follow a character sequence:
36.	Special classes for regular expression
37.	Regular expressions using character classes

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