Which is the simplest way to remove all whitespace from a string? Is there a
simpler method than a regex replace?
Or how can I tell a regex pattern to ignore all whitespace in my subject
string? There is a global modifier to ignore all spaces in the pattern, but
I couldn't find one for ignoring spaces in the subject string. Do I really
have to either do a preg_replace to remove all whitespace or stick a lot of
\s* into my search pattern?
Greetings,
Thomas 9 89673
Thomas Mlynarczyk wrote: Which is the simplest way to remove all whitespace from a string? Is there a simpler method than a regex replace? Or how can I tell a regex pattern to ignore all whitespace in my subject string? There is a global modifier to ignore all spaces in the pattern, but I couldn't find one for ignoring spaces in the subject string. Do I really have to either do a preg_replace to remove all whitespace or stick a lot of \s* into my search pattern?
Greetings, Thomas
PS....
$nospaces = str_replace(' ', '', $input);
will strip spaces; if you want to take out carriage returns, newlines, etc
you'll need
str_replace("\n", ''
str_replace("\r", ''
etc
In article <bg*************@news.t-online.com>,
"Thomas Mlynarczyk" <bl*************@hotmail.com> wrote: Which is the simplest way to remove all whitespace from a string?
*All whitespace*, not just space character?
$after=preg_replace('/\s+/','',$before);
(Or the ereg equivalent would be [[:space:]].)
Is there a simpler method than a regex replace?
Assuming the above, and that your PHP does have PCRE support compiled in,
not really. Any particular reason why want to avoid a regex? PCRE is very
fast and (in this case) very simple.
Or how can I tell a regex pattern to ignore all whitespace in my subject string?
Well, it's possible to tell PCRE to "find X except where it comes
before/after Y", if that's what you mean... It would help if you
elaborated on what specifically you want to accomplish.
There is a global modifier to ignore all spaces in the pattern, but I couldn't find one for ignoring spaces in the subject string. Do I really have to either do a preg_replace to remove all whitespace or stick a lot of \s* into my search pattern?
It depends on what you need to match. Sometimes when PCRE newbies are
tempted to use a lot of \s* they're attempting to workarounds problems for
which PCRE already has more graceful solutions. For instance, ungreedy
matching is often what they need. Or word boundary matching. Or just a
carefully-placed ".*". Etc. If you explain what you want to do, there
may well be non-kludge solution which we can suggest to you.
--
CC
Also sprach CC Zona: Which is the simplest way to remove all whitespace from a string?
*All whitespace*, not just space character? $after=preg_replace('/\s+/','',$before);
Would it make a difference if it was just the space character? (I mean would
there be a non-regex solution in that case?)
Is there a simpler method than a regex replace?
Assuming the above, and that your PHP does have PCRE support compiled in, not really. Any particular reason why want to avoid a regex?
Given the possibilities of regex's, they probably use up a lot of either
system ressources or processing time (or both), so one should not use them
when there are other possible solutions.
PCRE is very fast and (in this case) very simple.
Does this mean system ressources and processing time are not an issue here?
Or how can I tell a regex pattern to ignore all whitespace in my subject string?
Well, it's possible to tell PCRE to "find X except where it comes before/after Y", if that's what you mean... It would help if you elaborated on what specifically you want to accomplish.
Basically, I want to parse a string and for the sake of better readability I
want to allow whitespace, just like "$var=1;" and " $var = 1; ". But for
parsing it's easier when there is no whitespace or when the parsing regex
can just ignore it.
Also sprach matty: Which is the simplest way to remove all whitespace from a string? Is there a simpler method than a regex replace? Or how can I tell a regex pattern to ignore all whitespace in my subject string? There is a global modifier to ignore all spaces in the pattern, but I couldn't find one for ignoring spaces in the subject string. Do I really have to either do a preg_replace to remove all whitespace or stick a lot of \s* into my search pattern?
Depends what you want to match/replace - what are you doing with it?
The whitespace is just there for better readability, but should have no
impact whatsoever on the parsing of the string as it doesn't have any
"meaning".
Also sprach matty: $nospaces = str_replace(' ', '', $input);
will strip spaces; if you want to take out carriage returns, newlines, etc you'll need str_replace("\n", '' str_replace("\r", ''
Thanks for this hint, but I was hoping there could be something like trim(),
but working on spaces in the middle of the string as well. So str_replace()
is already the most simple thing to do in my case?
Thomas Mlynarczyk wrote: Also sprach CC Zona:
Which is the simplest way to remove all whitespace from a string? *All whitespace*, not just space character? $after=preg_replace('/\s+/','',$before);
Would it make a difference if it was just the space character? (I mean would there be a non-regex solution in that case?) Is there a simpler method than a regex replace? Assuming the above, and that your PHP does have PCRE support compiled in, not really. Any particular reason why want to avoid a regex?
Given the possibilities of regex's, they probably use up a lot of either system ressources or processing time (or both), so one should not use them when there are other possible solutions.
PCRE is very fast and (in this case) very simple.
Does this mean system ressources and processing time are not an issue here? Or how can I tell a regex pattern to ignore all whitespace in my subject string?
Well, it's possible to tell PCRE to "find X except where it comes before/after Y", if that's what you mean... It would help if you elaborated on what specifically you want to accomplish.
Basically, I want to parse a string and for the sake of better readability I want to allow whitespace, just like "$var=1;" and " $var = 1; ". But for parsing it's easier when there is no whitespace or when the parsing regex can just ignore it.
preg_match_all('/(\$[^ =]+)\s*\=\s*([^;]+);/', $input, $matches); should do
what you want; the pcre stuff is pretty good, and if you'd be doing a str_replace
first, you're better off just matching the values out
--
Matt Mitchell - AskMeNoQuestions
Dynamic Website Development and Marketing
In article <bg*************@news.t-online.com>,
"Thomas Mlynarczyk" <bl*************@hotmail.com> wrote: *All whitespace*, not just space character? $after=preg_replace('/\s+/','',$before); Would it make a difference if it was just the space character? (I mean would there be a non-regex solution in that case?)
str_replace. If you really are that adamently opposed to using regex, you
certainly could use a series of str_replace operations to remove all
whitespace characters. (But since processing time
to be your concern, benchmark it because I suspect that approach would
actually take more time than a single preg_replace.) PCRE is very fast and (in this case) very simple.
Does this mean system ressources and processing time are not an issue here?
For a single preg_replace of whitespace? That is absolutely trivial. If
that is your reason for avoiding regex, don't bother. For something like
this, it's your programming resources/time that are invaluable: a single
operation is quick to write, easy to read/debug/change, etc. When you're
doing multiple capturing expressions against large arrays, then it's worth
spending some of your time to optimize; for this, no.
Basically, I want to parse a string and for the sake of better readability I want to allow whitespace, just like "$var=1;" and " $var = 1; ".
For example...?
--
CC
CC Zona: In article <bg*************@news.t-online.com>, "Thomas Mlynarczyk" <bl*************@hotmail.com> wrote:
> *All whitespace*, not just space character? > $after=preg_replace('/\s+/','',$before);
Would it make a difference if it was just the space character? (I mean would there be a non-regex solution in that case?)
str_replace. If you really are that adamently opposed to using regex, you certainly could use a series of str_replace operations to remove all whitespace characters. (But since processing time to be your concern, benchmark it because I suspect that approach would actually take more time than a single preg_replace.)
Which is faster I don't know, but you only need one call to str_replace,
e.g.:
str_replace(array("\n", "\r", "\t", " "), '', $str);
André Nęss
Thomas Mlynarczyk: Also sprach André Nęss:
Which is faster I don't know, but you only need one call to str_replace, e.g.: str_replace(array("\n", "\r", "\t", " "), '', $str);
Wow - *that* would work? I didn't know you could pass an array to str_replace. But would it "perform" significantly better than a set of several separate str_replace() calls?
No idea, you can always benchmark it though. If the performance difference
between using regex, several str_replace or one str_replace matters to your
application, you probably shouldn't be doing that particular part in PHP
anyway...
In cases where str_replace is sufficient I prefer it. When people see
regular expression it's probably easy to think "Something complicated is
happening here", whereas with str_replace it's very straightforward.
But most scripters are fairly good at regular expressions, so it's not
really a very strong argument.
André Nęss This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: Purdy |
last post by:
I have an asp.net application.
i export to excel, in exporting to excel i use an xslt to define the
columns and look.
on one of the fields i need the word 'qty' but i need it to look like
' ...
|
by: soni29 |
last post by:
hi,
how can i remove a string from an existing string in javascript. i
have a textbox in a form and want to make sure that when the user
clicks a button that certain words are moved, like all...
|
by: shallow |
last post by:
Hi all,
msaccess (2003) seems to be unable to cope with whitespace strings:
let's assume a table with a text field as primary key.
now enter a new record that has a number of spaces and only...
|
by: threecrans |
last post by:
If you create a new server control, and override the Render method with the
following code:
protected override void Render(HtmlTextWriter output)
{
// <TABLE id="mytable">...
|
by: teenIce |
last post by:
Hi all,
Does anyone have suggestion what can I do to remove some string from a string?
Like this :
Original : I have a cat.
Remove : have
Result : I a cat.
Thanks in advance.
|
by: howa |
last post by:
Consider an example:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<style>
a { background-color:red;}
</style>
</head>
|
by: laredotornado |
last post by:
Hi,
I'm using PHP 5. I have an array of strings. What is the simplest
way to remove the elements that are empty, i.e. where the expression
"empty($elt)" returns true?
Thanks, - Dave
|
by: ziycon |
last post by:
I have the below code and I'm working how I would go about getting it to align at the left and remove all the white space while keeping the formatting/indenting in place?
Edit: Its all contained...
|
by: CloudSolutions |
last post by:
Introduction:
For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
|
by: Faith0G |
last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome former...
|
by: taylorcarr |
last post by:
A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...
|
by: Charles Arthur |
last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
|
by: ryjfgjl |
last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
by: emmanuelkatto |
last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud.
Please let me know.
Thanks!
Emmanuel
|
by: nemocccc |
last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
| |