I'm not too great at preg_match yet and I was wondering if someone could give me a hand.
I have an array of values e.g. array("black*", "blue", "red", "grey*") I need to find the values with a * at the end then return the word before it.
I believe preg_match() is the best way of doing it but I'm open to suggestions.
Thanks in advanced!
If you must use a regex...
$words = array_map(function($word) {
return preg_replace('/\*\z/', '', $word);
}, $arr);
CodePad.
...but you're probably better off not using regex and using something like...
$words = array_map(function($word) {
return rtrim($word, '*');
}, $arr);
CodePad.
If you want to return only the words which have a trailing *, try something like this first...
$words = preg_grep('/\*\z/', $arr);
CodePad.
The only disadvantage with this (as mentioned in the comments) is PHP will iterate twice over the array. You can simply use a foreach loop to do both of these in one loop if you wish.
Also, it is worth mentioning anonymous functions are a PHP 5.3 thing. You can still most of this code, just separate the functions into their own named functions and pass a reference to them.
If you always have an array like that (i.e. no complex strings, just word*), you really shouldn't use regular expressions, it's an overkill.
Use string functions, like strpos for searching and str_replace or rtrim for removing *.
If you don't need fancy replacing rules (like regular expressions), you should always use this function instead of preg_replace().
— from str_replace manual
Don't need to use preg_match for this - simple char lookup on the string will work:
$words = array('red*', 'grey', 'white', 'green*');
$return = array();
foreach ($words as $word) {
if ($word[strlen($word) - 1] === '*') {
$return[] = substr($word, 0, -1);
}
}
var_dump($return);
Related
I know that the answer is probably simple and I am just not seeing it.
This code gets me an array of "tags" in the layout (eg [[tag]]), and I have an array of replacements that comes in with the request ($this->data). My first inclination was to use preg_match_all to get an array of all the tags and just pass in both arrays:
if(isset($this->layout))
{
ob_start();
include(VIEWS.'layouts/'.$this->layout.'.phtml');
$this->layout = ob_get_contents();
preg_match_all('/\[\[.*\]\]/', $this->layout, $tags);
print preg_replace($tags, $this->data, $this->layout);
}
But the arrays are not the same length (most of the time). The layout might reuse some tags, and the passed in data variables might not include some tags in the layout.
I feel like there must be a more efficient way to do this than doing a foreach and building the output in iterations.
This project is way too small to implement a full templating engine like Smarty or Twig... it is actually just a few pages and a few replacements. My client just wants a simple way to add things like page titles and email recipients, etc.
Any advice would be appreciated. Like I said, I am positive that it is something simple that I am overlooking.
EDIT:
$this->data is an array of replacement text that look like:
tag => replacement_text
EDIT 2:
If I user preg_match_all('/\[\[(.*)\]\]/', $this->layout, $tags); the array includes JUST the tags (no [[]]), I just need a way to match them up with the array of replacement strings in $this->data.
You can simply use str_replace for this job, creating an array of search strings and replacements from $this->data:
$search = array_map(function ($s) { return "[[$s]]"; }, array_keys($this->data));
$replacements = array_values($this->data);
echo str_replace($search, $replacements, $this->layout);
Demo on 3v4l.org
You don't need to get $tags by matching $this->layout, the information is all in the keys of $this->data. You just need to add [[...]] around the keys.
$tags = array_map(function($key) {
return '/\[\[' . preg_quote($key) . '\]\]';
}, array_keys($this->data));
Another solution is to use preg_replace_callback() to look the tag up in $this->data;
echo preg_replace_callback('/\[\[(.*?)\]\]/', function($matches) {
return $this->data[$matches[1]] ?? $matches[0];
}, $this->layout);
Note that I changed the regexp to use a non-greedy quantifier; your regexp will match from the beginning of the first tag to the end of the last tag.
If the tag isn't found in $this->data, ?? $matches[0] leaves it unchanged.
You could make use of preg_replace_callback:
$result = preg_replace_callback('/\[\[(?<tag>.*?)]]/', function ($matches) {
return $this->data[$matches['tag']] ?? $matches[0];
}, $this->layout);
Demo: https://3v4l.org/I9Vvh
Shorter PHP 7.4 version:
$result = preg_replace_callback('/\[\[(?<tag>.*?)]]/', fn($matches) =>
$this->data[$matches['tag']] ?? $matches[0], $this->layout);
Edited with the ?? $matches[0] (courtesy of #Barmar) -- this is basically the same answer, just leaving it in case the PHP 7.4 syntax is useful.
$text = "
<tag>
<html>
HTML
</html>
</tag>
";
I want to replace all the text present inside the tags with htmlspecialchars(). I tried this:
$regex = '/<tag>(.*?)<\/tag>/s';
$code = preg_replace($regex,htmlspecialchars($regex),$text);
But it doesn't work.
I am getting the output as htmlspecialchars of the regex pattern. I want to replace it with htmlspecialchars of the data matching with the regex pattern.
what should i do?
You're replacing the match with the pattern itself, you're not using the back-references and the e-flag, but in this case, preg_replace_callback would be the way to go:
$code = preg_replace_callback($regex,'htmlspecialchars',$text);
This will pass the mathces groups to htmlspecialchars, and use its return value as replacement. The groups might be an array, in which case, you can try either:
function replaceCallback($matches)
{
if (is_array($matches))
{
$matches = implode ('', array_slice($matches, 1));//first element is full string
}
return htmlspecialchars($matches);
}
Or, if your PHP version permits it:
preg_replace_callback($expr, function($matches)
{
$return = '';
for ($i=1, $j = count($matches); $i<$j;$i++)
{//loop like this, skips first index, and allows for any number of groups
$return .= htmlspecialchars($matches[$i]);
}
return $return;
}, $text);
Try any of the above, until you find simething that works... incidentally, if all you want to remove is <tag> and </tag>, why not go for the much faster:
echo htmlspecialchars(str_replace(array('<tag>','</tag>'), '', $text));
That's just keeping it simple, and it'll almost certainly be faster, too.
See the quickest, easiest way in action here
If you want to isolate the actual contents as defined by your pattern, you could use preg_match($regex,$text,$hits);. This will give you an array of hits those bits that were between the paratheses in the pattern, starting at $hits[1], $hits[0] contains the whole matched string). You can then start manipulating these found matches, possibly using htmlspecialchars ... and combine them again into $code.
Is there a simple way to use ltrim() to remove a single instance of a match instead of all matches?
I'm looping through array of strings and I'd like to remove the first, and only first, match (vowels in this case):
ltrim($value, "aeiouyAEIOUY");
With default behavior the string aardvark or Aardvark would be trimmed to be "rdvark". I'd like result to be "ardvark".
I'm not bound to ltrim by any means but it seemed the closest built-in PHP function. It would be nice of ltrim and rtrim had an optional parameter "limit", just saying... :)
Just use preg replace it has a limit option
eg
$value = preg_replace('/^[aeiouy]/i', '', $value, 1);
Regular expressions is probably overkill, but:
$value = preg_replace('/^[aeiouy]/i', '', $value);
Note the i makes it case-insensitive.
You can't use ltrim to do this for the reasons you say, nor can you use str_replace (which also has no limit). I think it's easiest just to use a regex:
$value = preg_replace('/^[aeiouy]/i', '', $value);
However if you really don't want to do that, you can use a substring, but you would have to check the position of any of those strings in the string in a loop as there is no php function that does such a check that I know of.
You can use the preg_replace function:
<?php
$value = preg_replace('/^[aeiouy]/i', '', $value);
?>
There are several way you can go about doing what you are looking to do.
Perhaps most straightforward would be a regular expression replacement like this:
$pattern = '/^[aeiouy]{1}/i';
$result = preg_replace($pattern, '', $original_string);
This is probably the most efficient way (so ignore my regular expressions answer):
if (strpos('aeiouyAEIOUY', $value[0]) !== false) $value = substr($value, 1);
Or,
if (stripos('aeiouy', $value[0]) !== false) $value = substr($value, 1);
$var="UseCountry=1
UseCountryDefault=1
UseState=1
UseStateDefault=1
UseLocality=1
UseLocalityDefault=1
cantidad_productos=5
expireDays=5
apikey=ABQIAAAAFHktBEXrHnX108wOdzd3aBTupK1kJuoJNBHuh0laPBvYXhjzZxR0qkeXcGC_0Dxf4UMhkR7ZNb04dQ
distancia=15
AutoCoord=1
user_add_locality=0
SaveContactForm=0
ShowVoteRating=0
Listlayout=0
WidthThumbs=100
HeightThumbs=75
WidthImage=640
HeightImage=480
ShowImagesSystem=1
ShowOrderBy=0
ShowOrderByDefault=0
ShowOrderDefault=DESC
SimbolPrice=$
PositionPrice=0
FormatPrice=0
ShowLogoAgent=1
ShowReferenceInList=1
ShowCategoryInList=1
ShowTypeInList=1
ShowAddressInList=1
ShowContactLink=1
ShowMapLink=1
ShowAddShortListLink=1
ShowViewPropertiesAgentLink=1
ThumbsInAccordion=5
WidthThumbsAccordion=100
HeightThumbsAccordion=75
ShowFeaturesInList=1
ShowAllParentCategory=0
AmountPanel=
AmountForRegistered=5
RegisteredAutoPublish=1
AmountForAuthor=5
AmountForEditor=5
AmountForPublisher=5
AmountForManager=5
AmountForAdministrator=5
AutoPublish=1
MailAdminPublish=1
DetailLayout=0
ActivarTabs=0
ActivarDescripcion=1
ActivarDetails=1
ActivarVideo=1
ActivarPanoramica=1
ActivarContactar=1
ContactMailFormat=1
ActivarReservas=1
ActivarMapa=1
ShowImagesSystemDetail=1
WidthThumbsDetail=120
HeightThumbsDetail=90
idCountryDefault=1
idStateDefault=1
ms_country=1
ms_state=1
ms_locality=1
ms_category=1
ms_Subcategory=1
ms_type=1
ms_price=1
ms_bedrooms=1
ms_bathrooms=1
ms_parking=1
ShowTextSearch=1
minprice=
maxprice=
ms_catradius=1
idcatradius1=
idcatradius2=
ShowTotalResult=1
md_country=1
md_state=1
md_locality=1
md_category=1
md_type=1
showComments=0
useComment2=0
useComment3=0
useComment4=0
useComment5=0
AmountMonthsCalendar=3
StartYearCalendar=2009
StartMonthCalendar=1
PeriodOnlyWeeks=0
PeriodAmount=3
PeriodStartDay=1
apikey=ABQIAAAAJ879Hg7OSEKVrRKc2YHjixSmyv5A3ewe40XW2YiIN-ybtu7KLRQiVUIEW3WsL8vOtIeTFIVUXDOAcQ
";
in that string only i want "api==ABQIAAAAJ879Hg7OSEKVrRKc2YHjixSmyv5A3ewe40XW2YiIN-ybtu7KLRQiVUIEW3WsL8vOtIeTFIVUXDOAcQ";
plz guide me correctly;
EDIT
As shamittomar pointed out, the parse_str will not work for this situation, posted the proper regex below.
Given this seems to be a QUERY STRING, use the parse_str() function PHP provides.
UPDATE
If you want to do it with regex using preg_match() as powertieke pointed out:
preg_match('/apikey=(.*)/', $var, $matches);
echo $matches[1];
Should do the trick.
preg_match(); should be right up your alley
people are so fast to jump to preg match when this can be done with regular string functions thats faster.
$string = '
expireDays=5
apikey=ABQIAAAAFHktBEXrHnX108wOdzd3aBTupK1kJuoJNBHuh0laPBvYXhjzZxR0qkeXcGC_0Dxf4UMhkR7ZNb04dQ
distancia=15
AutoCoord=1';
//test to see what type of line break it is and explode by that.
$parts = (strstr($string,"\r\n") ? explode("\r\n",$string) : explode("\n",$string));
$data = array();
foreach($parts as $part)
{
$sub = explode("=",trim($part));
if(!empty($sub[0]) || !empty($sub[1]))
{
$data[$sub[0]] = $sub[1];
}
}
and use $data['apikey'] for your api key, i would also advise you to wrpa in function.
I can bet this is a better way to parse the string and much faster.
function ParsemyString($string)
{
$parts = (strstr($string,"\r\n") ? explode("\r\n",$string) : explode("\n",$string));
$data = array();
foreach($parts as $part)
{
$sub = explode("=",trim($part));
if(!empty($sub[0]) || !empty($sub[1]))
{
$data[$sub[0]] = $sub[1];
}
}
return $data;
}
$data = ParsemyString($string);
First of all, you are not looking for
api==ABQIAAAAJ879Hg7OSEKVrRKc2YHjixSmyv5A3ewe40XW2YiIN-ybtu7KLRQiVUIEW3WsL8vOtIeTFIVUXDOAcQ
but you are looking for
apikey=ABQIAAAAJ879Hg7OSEKVrRKc2YHjixSmyv5A3ewe40XW2YiIN-ybtu7KLRQiVUIEW3WsL8vOtIeTFIVUXDOAcQ
It is important to know if the api-key property always occurs at the end and if the length of the api-key value is always the same. I this is the case you could use the PHP substr() function which would be easiest.
If not you would most probably need a regular expression which you can feed to PHPs preg_match() function. Something along the lines of apikey==[a-zA-Z0-9\-] Which matches an api-key containing a-z in both lowercase and uppercase and also allows for dashes in the key. If you are using the preg_match() function you can retrieve the matches (and thus your api-key value).
Please excuse my noob-iness!
I have a $string, and would like to see if it contains any one or more of a group of words, words link ct, fu, sl** ETC. So I was thinking I could do:
if(stristr("$input", "dirtyword1"))
{
$input = str_ireplace("$input", "thisWillReplaceDirtyWord");
}
elseif(stristr("$input", "dirtyWord1"))
{
$input = str_ireplace("$input", "thisWillReplaceDirtyWord2");
}
...ETC. BUT, I don't want to have to keep doing if/elseif/elseif/elseif/elseif...
Can't I just do a switch statement OR have an array, and then simply say something like?:
$dirtywords = { "f***", "c***", w****", "bit**" };
if(stristr("$input", "$dirtywords"))
{
$input = str_ireplace("$input", "thisWillReplaceDirtyWord");
}
I'd appreciate any help at all
Thank you
$dirty = array("fuc...", "pis..", "suc..");
$censored = array("f***", "p***", "s***");
$input= str_ireplace($dirty, $censored , $input);
Note, that you don't have to check stristr() to do a str_ireplace()
http://php.net/manual/en/function.str-ireplace.php
If search and replace are arrays, then str_ireplace() takes a value from each array and uses them to do search and replace on subject. If replace has fewer values than search, then an empty string is used for the rest of replacement values. If search is an array and replace is a string, then this replacement string is used for every value of search.
Surely not the best solution since I don't know too much PHP, but what about a loop ?
foreach (array("word1", "word2") as $word)
{
if(stristr("$input", $word))
{
$input = str_ireplace("$input", $word" "thisWillReplaceDirtyWord");
}
}
When you have several objects to test, think "loop" ;-)