I have a string like
some text for test and need to replace by regex using php
we have extra sentence too
I need to replace the sentence before the word regex
I need a result of
using php
we have extra sentence too
Replace some text for test and need to replace by regex by ""
PHP can use \K
Use this simple regex:
(?s)^.*?regex\K.*
See demo.
(?s) allows the dot to match across several lines.^ asserts that we are at the beginning of the string..*?regex lazily matches everything up to regex\K tells the engine to "Keep" everything it has matched so far out of the returned match (drop it).* matches everything else. This is the returned match.In PHP, no need to replace. As the output of this php demo shows, you can just match:
$mystring = "some text for test and need to replace by regex using php.
We have another sentence";
$regex = '~(?s)^.*?regex\K.*~';
if (preg_match($regex, $mystring, $m)) {
$yourmatch = $m[0];
echo $yourmatch;
}
Let me know if you have any questions. :)
You don't need regex for this. You can use substr() and strpos():
$str = substr($str, strpos($str, 'regex') + 6);
The below regex will match only the characters which are just after to the string regex,
/(?<=regex\s)(.*)/s
Your PHP code would be,
<?php
$mystring = "some text for test and need to replace by regex using php.
We have another sentence";
$regex = '~(?s)(?<=regex\s)(.*)~';
if (preg_match($regex, $mystring, $m)) {
$yourmatch = $m[0];
echo $yourmatch;
}
?>
Output:
using php.
We have another sentence
Explanation:
(?s) # Allows . to match anything(including newlines)
(?<=regex\s)(.*) # Positive lookbehind is used. It matches anything after the string regex followed by a space.
