<?php
//(?=) - positive lookahead
$string = "achei quebra; tem aqui;";
$regex = "/\w+(?=;)/";
preg_match_all($regex, $string, $matches);
var_dump($matches);
//(?!) - negative lookahead /
$regex = "/\b\w+\b(?!;)/";
preg_match_all($regex, $string, $matches);
var_dump($matches);
//(?<=) - positive lookbehind
$string = "dra Julia \ndr Marcos \ndr Mateus \ndra Ana";
$regex = "/(?<=dra\s)(\w+)/im";
preg_match_all($regex, $string, $matches);
var_dump($matches);
//(?<!) - negative lookbehind
$regex = "/(?<!^dra\s)\b\w+\b$/im";
preg_match_all($regex, $string, $matches);
var_dump($matches);
/*
(?>) - atomic group
*/
- Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
- array(1) {
[0]=>
array(2) {
[0]=>
string(6) "quebra"
[1]=>
string(4) "aqui"
}
}
array(1) {
[0]=>
array(2) {
[0]=>
string(5) "achei"
[1]=>
string(3) "tem"
}
}
array(2) {
[0]=>
array(2) {
[0]=>
string(5) "Julia"
[1]=>
string(3) "Ana"
}
[1]=>
array(2) {
[0]=>
string(5) "Julia"
[1]=>
string(3) "Ana"
}
}
array(1) {
[0]=>
array(0) {
}
}
- Output for 8.3.5
- Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
array(1) {
[0]=>
array(2) {
[0]=>
string(6) "quebra"
[1]=>
string(4) "aqui"
}
}
array(1) {
[0]=>
array(2) {
[0]=>
string(5) "achei"
[1]=>
string(3) "tem"
}
}
array(2) {
[0]=>
array(2) {
[0]=>
string(5) "Julia"
[1]=>
string(3) "Ana"
}
[1]=>
array(2) {
[0]=>
string(5) "Julia"
[1]=>
string(3) "Ana"
}
}
array(1) {
[0]=>
array(0) {
}
}
preferences:
182.74 ms | 403 KiB | 210 Q