Regex remove everything after Regex Match - php

$str = preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $str);
I have this code, this removes all encoded chars, how can I make it remove everything after the first match (including the first match)


Use a wildcard in the regexp:
$str = preg_replace('/[\x00-\x1F\x80-\xFF].*/', '', $str);

Related

preg_replace with () characters

I want to use preg_replace to clean a string but I want to contine with this character () - Parentheses
I'm using this code
$string = preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $string);
$string = preg_replace('/[^\p{Latin}\d ]/u', '', $string);
I want to remove everything except the parentheses letters and numbers

If I understand you correctly, use:
/[^\p{Latin}0-9()]/u
That will match anything that is not parentheses, letters or numbers.
So the full code:
$string = preg_replace('/[^\p{Latin}0-9()]/u', '', $string);

Exclude link starts with a character from PREG_REPLACE

This codes convert any url to clickable link:
$str = preg_replace('/(http[s]?:\/\/[^\s]*)/i', '$1', $str);
How to make it not convert when url starts with [ character? Like this:
[http://google.com

Use a negative lookbehind:
$str = preg_replace('/(?<!\[)(http[s]?:\/\/[^\s]*)/i', '$1', $str);
^^^^^^^
Then, the http... substring that is preceded with [ won't be matched.
You may enhance the pattern as
preg_replace('/(?<!\[)https?:\/\/\S*/i', '$0', $str);
that is: remove the ( and ) (the capturing group) and replace the backreferences from $1 with $0 in the replacement pattern, and mind that [^\s] = \S, but shorter. Also, [s]? = s?.

PHP rtrim all trailing special characters

I'm making a function that that detect and remove all trailing special characters from string. It can convert strings like :
"hello-world"
"hello-world/"
"hello-world--"
"hello-world/%--+..."
into "hello-world".
anyone knows the trick without writing a lot of codes?

Just for fun
[^a-z\s]+
Regex demo
Explanation:
[^x]: One character that is not x sample
\s: "whitespace character": space, tab, newline, carriage return, vertical tab sample
+: One or more sample
PHP:
$re = "/[^a-z\\s]+/i";
$str = "Hello world\nhello world/\nhello world--\nhellow world/%--+...";
$subst = "";
$result = preg_replace($re, $subst, $str);

try this
$string = preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
or escape apostraphe from string
preg_replace('/[^A-Za-z0-9\-\']/', '', $string); // escape apostraphe

You could use a regex like this, depending on your definition of "special characters":
function clean_string($input) {
return preg_replace('/\W+$/', '', $input);
}
It replaces any characters that are not a word character (\W) at the end of the string $ with nothing. \W will match [^a-zA-Z0-9_], so anything that is not a letter, digit, or underscore will get replaced. To specify which characters are special chars, use a regex like this, where you put all your special chars within the [] brackets:
function clean_string($input) {
return preg_replace('/[\/%.+-]+$/', '', $input);
}

This one is what you are looking for. :
([^\n\w\d \"]*)$
It removes anything that is not from the alphabet, a number, a space and a new line.
Just call it like this :
preg_replace('/([^\n\w\s]*)$/', '', $string);

Regex to remove non-alphanumeric characters and all characters after dot?

I need a regular expression (php) to remove the forward slash, the dot and eveything after the dot in my string so that
$str = "ab/12c.3de";
becomes
$newstr = "ab12c";

You can use alternation in regex:
$str = "ab/12c.3de";
$newstr = preg_replace('~/|\..*~', '', $str);
//=> ab12c
Regex: /|\..*
/ matches literal /
| OR (alternation)
\..* matches a dot and everything after it
Replacement is just by empty string.

PHP Regex: Remove words less than 3 characters

I'm trying to remove all words of less than 3 characters from a string, specifically with RegEx.
The following doesn't work because it is looking for double spaces. I suppose I could convert all spaces to double spaces beforehand and then convert them back after, but that doesn't seem very efficient. Any ideas?
$text='an of and then some an ee halved or or whenever';
$text=preg_replace('# [a-z]{1,2} #',' ',' '.$text.' ');
echo trim($text);

Removing the Short Words
You can use this:
$replaced = preg_replace('~\b[a-z]{1,2}\b\~', '', $yourstring);
In the demo, see the substitutions at the bottom.
Explanation
\b is a word boundary that matches a position where one side is a letter, and the other side is not a letter (for instance a space character, or the beginning of the string)
[a-z]{1,2} matches one or two letters
\b another word boundary
Replace with the empty string.
Option 2: Also Remove Trailing Spaces
If you also want to remove the spaces after the words, we can add \s* at the end of the regex:
$replaced = preg_replace('~\b[a-z]{1,2}\b\s*~', '', $yourstring);
Reference
Word Boundaries

You can use the word boundary tag: \b:
Replace: \b[a-z]{1,2}\b with ''

Use this
preg_replace('/(\b.{1,2}\s)/','',$your_string);

As some solutions worked here, they had a problem with my language's "multichar characters", such as "ch". A simple explode and implode worked for me.
$maxWordLength = 3;
$string = "my super string";
$exploded = explode(" ", $string);
foreach($exploded as $key => $word) {
if(mb_strlen($word) < $maxWordLength) unset($exploded[$key]);
}
$string = implode(" ", $exploded);
echo $string;
// outputs "super string"

To me, it seems that this hack works fine with most PHP versions:
$string2 = preg_replace("/~\b[a-zA-Z0-9]{1,2}\b\~/i", "", trim($string1));
Where [a-zA-Z0-9] are the accepted Char/Number range.

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