| Re: reduce all spaces to one [message #176907 is a reply to message #176906] |
Sat, 04 February 2012 21:00   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 2/4/2012 10:21 AM, Thomas 'PointedEars' Lahn wrote:
> Ahh, there was more nonsense to be corrected …
>
> Jerry Stuckle wrote:
>
>> On 2/4/2012 9:41 AM, Thomas 'PointedEars' Lahn wrote:
>>> John wrote:
>>>> Am 03.02.2012 21:19, schrieb M. Strobel:
>>>> > Solution shootout:
>>>> > strobel@s114-intel:~> php -a
>>>> > Interactive shell
>>>> >
>>>> > php> echo str_replace(' ',' ','here are some spaces ');
>>>> > here are some spaces
>>>> > php> echo preg_replace('/\s+/', ' ', 'here are some spaces
>>>> > '); here are some spaces
>>>> > php>
>>>> >
>>>> > The regex solution is the winner.
>>>>
>>>> OK. Thanks to all those who answered !!
>>>
>>> It should be noted that if your question was understood literally, the
>>> solutions presented so far would be wrong. \s would match too many
>>> different characters, as it stands for *white-space* in PCRE, _not_ only
>>> the
>>> space character. In order to reduce only all consecutive *space*
>>> characters to one space character, you need to write
>>>
>>> echo preg_replace('/ +/', ' ', "here are some \n spaces ");
>>>
>>> Note that the newline, which is white-space too, is preserved here.
>>>
>>
>> Newline is preserved in my version also, if you understood ANYTHING
>> about how PHP's regex's work (but we already know you don't).
>
> JFYI, with preg_* methods, PHP's Regular Expressions are *Perl-Compatible*
> Regular Expressions. That is what the `p' stands for there (as opposed to
> ereg_*, which are now [PHP 5.3] deprecated methods using POSIX *E*xtended
> Regular Expressions).
>
>>> If you want to make the space character in the expression better visible,
>>> you can use
>>>
>>> (1) echo preg_replace('/\ +/', ' ', "here are some \n spaces
>>> ");
>>>
>>
>> The search pattern is invalid.
>
> Perfectly valid
>
> $ php -v
> PHP 5.3.10-1 (cli) (built: Feb 3 2012 10:03:01)
> Copyright (c) 1997-2012 The PHP Group
> Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies
> with XCache v1.3.2, Copyright (c) 2005-2011, by mOo
> with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans
> with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH
>
>>> or
>>>
>>> (2) echo preg_replace('/\\ +/', ' ', "here are some \n spaces
>>> ");
>>>
>>
>> Searches for the sequence '\ '
>
> Not in the PHP version mentioned above.
>
>>> or
>>>
>>> (3) echo preg_replace('/\x20+/', ' ', "here are some \n spaces
>>> ");
>>>
>>
>> Ugh!
>
> man 3 pcrepattern
>
>>> or
>>>
>>> (4) echo preg_replace('/\\x20+/', ' ', "here are some \n spaces
>>> ");
>>>
>>
>> Again, invalid escape sequence.
>
> Again, perfectly valid and working as intended in the PHP version mentioned
> above. Probably valid in *all* PHP versions that support PCREs. You have
> not bothered to do any tests before posting, have you?
>
>>> Your approach,
>>>
>>> echo preg_replace('/[ ]+/', ' ', "here are some \n spaces
>>> ");
>>>
>>> is equivalent to that, but slightly less efficient because of the
>>> character class (even in Visual Basic .NET). However, it also has the
>>> advantage over the simple solutions (1) and (2) that multiple spaces in
>>> the character class will still only match one space.
>>
>> Showing your ignorance again. You do better when you keep your mouth
>> shut.
>
> Pot, kettle, black.
>
>
> PointedEars
Your ability to state the obvious is only exceeded by your stoopidity
and ability to confuse a simple issue.
No one here gives a damn about your ability to cut and paste answers
just to try to prove you know something. We know you don't - just like
in other usenet newsgroups.
And we know that lack of appreciation for your stoopidity riles you to
no end.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================
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