1.2.749. Named Regex¶
Captured subpatterns may be named, for easier reference.
From the manual : It is possible to name a subpattern using the syntax (?P<name>pattern). This subpattern will then be indexed in the matches array by its normal numeric position and also by name. PHP 5.2.2 introduced two alternative syntaxes (?<name>pattern) and (?'name'pattern).
Naming subpatterns makes it easier to know what is read from the results of the subpattern : for example, $r['name'] has more meaning than $r[1].
Named subpatterns may also be shifted in the regex without impact on the resulting array.
<?php
$x = 'abc';
preg_match_all('/(?<name>a)/', $x, $r);
print_r($r[1]);
print_r($r['name']);
preg_match("/(?<name>a)(?'sub'b)/", $x, $s);
print $s[2];
print $s['sub'];
?>
See also Subpatterns.
1.2.749.1. Suggestions¶
Use named regex, and stop using integer-named subpatterns
1.2.749.2. Specs¶
Short name |
Structures/NamedRegex |
Rulesets |
|
Exakat since |
1.4.9 |
PHP Version |
All |
Severity |
|
Time To Fix |
|
Precision |
High |
Features |
regex |
Examples |
|
Available in |