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PHP正则表达式\'*\'

GG网络技术分享 2025-03-18 16:15 7

问题描述：

I have a string ending with \'*\' or \'^\'.
For example:

$variable = \'abcdef**^^\';

I used preg_split() function to split the string.

$variable = \'abcdef*^^^^\';
$words = preg_split(\"/(?<=\\w)\\b[!?.]*/\", $variable, -1, PREG_SPLIT_NO_EMPTY);

And I got the output as

Array
(
[0] => abcdef
[1] => *^^^^
)

But the problem begins, when my variable is replaced with \'@\',\'\' and some other special characters.
For Example:

$variable = \'abc@d ef*^^^\';

Output become like this

Array
(
[0] => abcd
[1] => @ ef
[2] => *^^^^
)

I need the output like this

Array
(
[0] => abcd@ ef
[1] => *^^^^
)

I was trying to replace my current RegEx with RegEx for \'*\' and \'^\', But I can\'t find one.

网友观点：

Thank you for all your answers.
I have figured my solution by the references you all given.
I am posting it,May help anyone in future..

<?php
$variable = \'Chloride TDS\';
if (preg_match(\'/[\\*^]/\', $variable))
{
if ( strpos( $variable, \'*\' ) < strpos( $variable, \'^\' )   || strpos( $variable, \'^\' ) === false ) 
{
$first = strstr($variable, \'*\', true);
$last = strstr($variable, \'*\');
}
if ( strpos( $variable, \'^\' ) < strpos( $variable, \'*\' ) && strpos($variable,\'^\') != \'\' || strpos( $variable, \'*\' ) === false ) 
{
$first = strstr($variable, \'^\', true);
$last = strstr($variable, \'^\');
}
echo $first;
echo \'<br/>\';
echo $last;
}else{
echo $variable;
}
?>

use \\* for star. below are the example

<?php
$variable = \'abc@d ef*^^^\';
$words = preg_split(\\\"/\\*/\\\", $variable, -1, PREG_SPLIT_NO_EMPTY);
echo \\\"<pre>\\\";
print_r($words);  
?>

and it\'s output is this

Array
(
[0] => abc@d ef
[1] => ^^^
)

if you want to add * then used this

<?php
$variable = \'abc@d ef*^^^\';
$words = preg_split(\\\"/\\*/\\\", $variable, -1, PREG_SPLIT_NO_EMPTY);
$i=0;  
foreach ($words as $value) {
if($i != 0)
{
$words[$i]=\'*\'.$words[$i];
}
$i++;
}
echo \\\"<pre>\\\";
print_r($words);
?>

If your split character is just \\\"*\\\" you can use explode:

$words = explode(\'*\', $string, 2);

If it\'s \\\"*\\\" or \\\"^\\\" do this:

$words = preg_split(\\\"/[\\*,\\^]+/\\\", $str, -1, PREG_SPLIT_NO_EMPTY);

If i am grasping true meaning of the question, OP mentioned

I have a string ending with \'*\' or \'^\'.

If you want to split the string in this way, you should change the regexp like this.

$words = preg_split(\\\"/[\\*|\\^]/\\\", $variable, 2, PREG_SPLIT_NO_EMPTY);

This would break the string on first concurrence of * or ^. OP has already excepted an answer, but i am adding mine in case it helps anyone else in this situation.

Edit: You do not need to use preg_split() if you wanna do this. Simply use strstr with a few conditions.

$variable = \'abcd@ ef*\';
if ( strpos( $variable, \'*\' ) < strpos( $variable, \'^\' ) || strpos( $variable, \'^\' ) === false ) 
{
$first = strstr($variable, \'*\', true);
$last = strstr($variable, \'*\');
}
if ( strpos( $variable, \'^\' ) < strpos( $variable, \'*\' ) || strpos( $variable, \'*\' ) === false ) 
{
$first = strstr($variable, \'^\', true);
$last = strstr($variable, \'^\');
}
echo $first;
echo \'<br/>\';
echo $last;

This one is working on every case.