I want to replace a string at a particular position. For that I used str_replace() PHP function, but after that, I can't get an output. Here I show you what I want.
$str = "hello 8-7-2015 world -12";
// here I want replace - with ' desh ' but in date only. That I have detected using check before character if space than it should be 'minus' otherwise it should be 'desh'.
$key = strpos($str, "-");
if($key !== false){
$a = substr($str, $key-1 , 1);
if($a != " "){
$str = str_replace("-","desh",$str);
}else{
$str = str_replace("-","minus",$str);
}
}
I get output like: hello 8 desh 7 desh 2015 world desh 12 . Everywhere there is desh I want minus 12. Other values are okay and should not be changed.
Means particular position change.
Your code (with an if) doesn't loop over the string looking for all occurrences, so that should have raised an alert flag with you when all the occurrences were changed.
What it does is to find the first occurrence, which isn't preceded by a space, then it executes:
str_replace("-","desh",$str);
which replaces all occurrences within the string. In order to do what you want, all you need is:
str_replace(" -"," minus",$str);
str_replace("-","desh",$str);
This will first take care of all - character preceded by a space, turning them into " minus".
The second line will then take care of all the remaining - characters, replacing them with "desh".
Just as an aside, if you're doing this to be able to "speak" the words (in the sense of a text-to-speech (TTS) program), you probably want spaces on either sides of the words you're adding. You can achieve that with a very small modification:
str_replace(" -"," minus ",$str);
str_replace("-"," desh ",$str);
That may make it easier for your TTS code to handle the words.
There's no point in your condition since str_replace takes effect on whole the string without any relation to your $key variable.
$str = str_replace(" -","minus",$str);
$str = str_replace("-","desh",$str);
Truth is that you don't even need that condition. Simply use the first str_replace when the search term has blank space prior to it and the second str_replce doesn't. (order it's important).
You can use regex:
$str = preg_replace(
['/(\d{1,2})-(\d{1,2})-(\d{2,4})/','/-(\d+)/'],
['$1 desh $2 desh $3', 'minus $1'],
$str);
check this,
First you have to get the date from the string, then change the date format as you want after that concatenate with other strings
$str = explode(' ',$str);
$str1 = str_replace("-","desh",$str[1]);
$str2 = str_replace("-","minus",$str[2]);
$str = $str[0].$str1.$str2;
Related
I have a string in PHP
$string = "Dogs are Jonny's favorite pet";
I want to use regex or some method to remove s or 's from the end of all words in the string.
The desired output would be:
$revisedString = "Dog are Jonny favorite pet";
Here is my current approach:
<?php
$string = "Dogs are Jonny's favorite pet";
$stringWords = explode(" ", $string);
$counter = 0;
foreach($stringWords as $string) {
if(substr($string, -1) == s){
$stringWords[$counter] = trim($string, "s");
}
if(strpos($string, "'s") !== false){
$stringWords[$counter] = trim($string, "'s");
}
$counter = $counter + 1;
}
print_r($stringWords);
$newString = "";
foreach($stringWords as $string){
$newString = $newString . $string . " ";
}
echo $newString;
}
?>
How would this be achieved with REGEX?
For general use, you must leverage much more sophisticated technique than an English-ignorant regex pattern. There may be fringe cases where the following pattern fails by removing an s that it shouldn't. It could be a name, an acronym, or something else.
As an unreliable solution, you can optionally match an apostrophe then match a literal s if it is not immediately preceded by another s. Adding a word boundary (\b) on the end improves the accuracy that you are matching the end of words.
Code: (Demo)
$string = "The bass can access the river's delta from the ocean. The fishermen, assassins, and their friends are happy on the banks";
var_export(preg_replace("~'?(?<!s)s\b~", '', $string));
Output:
'The bass can access the river delta from the ocean. The fishermen, assassin, and their friend are happy on the bank'
PHP Live Regex always helped me a lot in such moments. Even already knowing how REGEX works, I still use it just to be sure some times.
To make use of REGEX in your case, you can use preg_replace().
<?php
// Your string.
$string = "Dogs are Jonny's favorite pet";
// The vertical bar means "or" and the backslash
// before the apostrophe is needed so you don't end
// your pattern string since we're using single quotes
// to delimit it. "\s" means a single space.
$regex_pattern = '/\'s\s|s\s|s$/';
// Fill the preg_replace() with the pattern, the replacement
// (a single space in this case), your string, -1 (so preg_replace()
// will replace all the matches) and a variable of your desire
// to be the "counter" (preg_replace() will automatically
// fill it).
$newString = preg_replace($regex_pattern, ' ', $string, -1, $counter);
// Use the rtrim() to remove spaces at the right of the sentence.
$newString = rtrim($newString, " ");
echo "New string: " . $newString . ". ";
echo "Replacements: " . $counter . ".";
?>
In this case, the function will identify any "'s" or "s" with spaces (\s) after them and then replace them with a single space.
The preg_replace() will also count all the replacements and register them automatically on $counter or any variable you place there instead.
Edit:
Phil's comment is right and indeed my previous REGEX would lose a "s" at the end of the string. Adding "|s$" will solve it. Again, "|" means "or" and the "$" means that the "s" must be at the end of the string.
In attention to mickmackusa's comment, my solution is meant only to remove "s" characters at the end of words inside the string as this was Sparky Johnson' request here. Removing plurals would require a complex code since not only we need to remove "s" characters from plural only words but also change verbs and other stuff.
For example, if I want to get rid of the repeating numeric suffix from the end of an expression like this:
some_text_here_1
Or like this:
some_text_here_1_5
and I want finally receive something like this:
some_text_here
What's the best and flexible solution?
$newString = preg_replace("/_?\d+$/","",$oldString);
It is using regex to match an optional underscore (_?) followed by one or more digits (\d+), but only if they are the last characters in the string ($) and replacing them with the empty string.
To capture unlimited _ numbers, just wrap the whole regex (except the $) in a capture group and put a + after it:
$newString = preg_replace("/(_?\d+)+$/","",$oldString);
If you only want to remove a numberic suffix if it is after an underscore (e.g. you want some_text_here14 to not be changed, but some_text_here_14 to be changed), then it should be:
$newString = preg_replace("/(_\d+)+$/","",$oldString);
Updated to fix more than one suffix
Strrpos is far better than regex on such a simple string problem.
$str = "some_text_here_13_15";
While(is_numeric(substr($str, strrpos($str, "_")+1))){
$str = substr($str,0 , strrpos($str, "_"));
}
Echo $str;
Strrpos finds the last "_" in str and if it's numeric remove it.
https://3v4l.org/OTdb9
Just to give you an idea of what I mean with regex not being a good solution on this here is the performance.
Regex:
https://3v4l.org/Tu8o2/perf#output
0.027 seconds for 100 runs.
My code with added numeric check:
https://3v4l.org/dkAqA/perf#output
0.003 seconds for 100 runs.
This new code performs even better than before oddly enough, regex is very slow. Trust me on that
You be the judge on what is best.
First you'll want to do a preg_replace() in order to remove all digits by using the regex /\d+/. Then you'll also want to trim any underscores from the right using rtrim(), providing _ as the second parameter.
I've combined the two in the following example:
$string = "some_text_here_1";
echo rtrim(preg_replace('/\d+/', '', $string), '_'); // some_text_here
I've also created an example of this at 3v4l here.
Hope this helps! :)
$reg = '#_\d+$#';
$replace = '';
echo preg_replace($reg, $replace, $string);
This would do
abc_def_ghi_123 > abc_def_ghi
abc_def_1 > abc_def
abc_def_ghi > abc_def_ghi
abd_def_ > abc_def_
abc_123_def > abd_123_def
in case of abd_def_123_345 > abc_def
one could change the line
$reg = '#(?:_\d+)+$#';
I have a string that begins with an empty space and a + sign :
$s = ' +This is a string[...]';
I can't figure out how to remove the first + sign using PHP. I've tried ltrim, preg_replace with several patterns and with trying to escape the + sign, I've also tried substr and str_replace. None of them is removing the plus sign at the beginning of the string. Either it doesn't replace it or it remplace/remove the totality of the string. Any help will be highly appreciated!
Edit : After further investigation, it seems that it's not really a plus sign, it looks 100% like a + sign but I think it's not. Any ideas for how to decode/convert it?
Edit 2 : There's one white space before the + sign. I'm using get_the_excerpt Wordpress function to get the string.
Edit 3 : After successfully removing the empty space and the + with substr($s, 2);, Here's what I get now :
$s == '#43;This is a string[...]'
Wiki : I had to remove 6 characters, I've tried substr($s, 6); and it's working well now. Thanks for your help guys.
ltrim has second parameter
$s = ltrim($s,'+');
edit:
if it is not working it means that there is sth else at the beginning of that string, eg. white spaces. You can check it by using var_dump($s); which shows you exactly what you have there.
You can use explode like this:
$result = explode('+', $s)[0];
What this function actually does is, it removes the delimeter you specify as a first argument and breaks the string into smaller strings whenever that delimeter is found and places those strings in an array.
It's mostly used with multiple ocurrences of a certain delimeter but it will work in your case too.
For example:
$string = "This,is,a,string";
$results = explode(',', $string);
var_dump($results); //prints ['This', 'is', 'a', 'string' ]
So in your case since the plus sign appears ony once the result is in the zero index of the returned array (that contains only one element, your string obviously)
Here's a couple of different ways I can think of
str_replace
$string = str_replace('+', '', $string);
preg_replace
$string = preg_replace('/^\+/', '', $string);
ltrim
$string = ltrim($string, '+');
substr
$string = substr($string, 1);
try this
<?php
$s = '+This is a string';
echo ltrim($s,'+');
?>
You can use ltrim() or substr().
For example :
$output = ltrim($string, '+');
or you can use
$output = substr($string, 1);
You can remove multiple characters with trim. Perhaps you were not re-assigning the outcome of your trim function.
<?php
$s = ' +This is a string[...]';
$s = ltrim($s, '+ ');
print $s;
Outputs:
This is a string[...]
ltrim in the above example removes all spaces and addition characters from the left hand side of the original string.
I am running into a problem trying to do a replacement on a few strings. Essentially what I have is a bunch of prices on my page that look like
RMB148.00
What i am trying to do is run a replace on only the last 2 numbers so i can do something like
RMB14800
Preg replace works fine for the RMB part because it is always there.
My problem is the last two numbers can be anything it all depends on the price so I cant just remove and replace, I need to just wrap HTML <sup> tags around them.
$string = $product['price'];
$string = preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $string);
echo preg_replace('/RMB/', '<sup class="currency-sym">RMB</sup>', $string, 1);
Assuming the last two characters are digits, you could just
$string=preg_replace('/(\d\d)$/', '<sup class="currency-sym">\1</sup>', $string);
If not,
$string=preg_replace('/(..)$/', '<sup class="currency-sym">\1</sup>', $string);
should do the trick.
Alternativly use
$string=substr($string,0,-2).'<sup class="currency-sym">'.substr($string,-2).'</sup>';
Here is a regex solution that looks for the final digit notation at the end of your string.
$string = 'RMB148.00';
$string = preg_replace('/(\d+)\.(\d{2})\z/','$1<sup>$2</sup>',$string);
echo $string;
You could use the following with the explode () function
$string = explode ('.', $product['price']);
$new_string = $string[0].'<sup>'. $string [1]. '</sup>';
And do the regex for the RMB the same way.
Code.
<?php
$string = '14842.00';
$string = substr($string, 0, strlen($string) - 2) . '<sup>' . substr($string, strlen($string) - 2, 2) . '</sup>';
echo $string;
Try online sandbox.
Explanation.
substr($s, $i, $l) gets $l symbols of $s, started from $i index (indexes starts from zero).
So first substr($string, 0, strlen($string) - 2) gets all string except last two symbols.
Second substr($string, strlen($string) - 2, 2) gets only last two symbols.
More about substr.
You should use a pattern matching regex. Note the $1 in the replacement argument matches (\d{2}) in the pattern argument. preg_replace() only replaces the matched pattern. This pattern matches . followed by any two digits. Since . is not included in the replacement argument it does not show up in your $string.
$string = preg_replace('/\.(\d{2})$/', '<sup>$1</sup>', $string);
Of course, you could use one preg_replace to do what you want:
$string = preg_replace('/^(RMB)(\d+)(\.(\d{2}))?$/', "<sup class='currency-sym'>$1</sup>$2<sup>$4</sup>", $string);
The second example may be a good idea if you want DOM integrity, otherwise it creates an empty <sup></sup> when there is no decimal.
Lots of topics on this but i can't figure it out, looking for some tips, shouldn't be that difficult.
I have filename:
test_file_from_mpc.mp4_snapshot_13.29_[2015.05.13_21.10.11].jpg
i'm trying to use regex to replace the characters _ and then everything starting from snapshot
I got snapshot covered, but i can't seem to get how to catch all the occurances of _ to be selected
(_)(snapshot)(.*)
selects only 1 _
I read that . should select "any single character" not sure how to use this properly or if it is what i am looking for.
Any guidance would be great! (this is probably 100% a dupe but i have checked all the suggested threads without finding the solution to this seemingly easy problem!)
Can't comment yet, but for regex to match more than one occurrence, you need the g - global modifier.
/(_snapshot.*$|_|\.)/gi
https://regex101.com/r/aI7fF8/2
If you replace purely with space all matching occurences, remember to trim last space.
Here's a php sample as well
<?php
$str = "test_file_from_mpc.mp4_snapshot_13.29_[2015.05.13_21.10.11].jpg";
$res = preg_replace(array("/_snapshot.*$/", "/[_.]/"), array("", " "), $str);
print $res; // test file from mpc mp4
snapshot.*$|[_.]
You can try this.Replace by space.See demo.
https://regex101.com/r/mT0iE7/13
$re = "/snapshot.*$|[_.]/im";
$str = "test_file_from_mpc.mp4_snapshot_13.29_[2015.05.13_21.10.11].jpg";
$subst = " ";
$result = preg_replace($re, $subst, $str);
Another (potentially faster, but not prettier) way would be to use explode() & implode().
// Split string by underscores
$pieces = explode('_', $filename);
// Get the number of pieces
$n = count($pieces);
// Keep just the file extension in the last piece
$pieces[$n] = substr($pieces[$n], strpos($pieces[$n], '.'));
// Remove the other unwanted pieces
unset($pieces[$n - 1];
unset($pieces[$n - 2];
// Reassemble with spaces instead of underscores
$new_string = implode(' ', $pieces);