| Re: reduce all spaces to one [message #176923 is a reply to message #176904] |
Sun, 05 February 2012 20:47   |
Michael Fesser
Messages: 215
Registered: September 2010
Karma:
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Senior Member |
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.oO(Jerry Stuckle)
> On 2/4/2012 9:41 AM, Thomas 'PointedEars' Lahn wrote:
>>
>> 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).
You want to read the manual and not start a flame war everytime you
answer to a person you don't like.
By default \s also matches LF and CR, because internally the C library
function isspace() function is used:
http://www.cplusplus.com/reference/clibrary/cctype/isspace/
> It also
> takes out tabs - which may be inserted automatically by some editors,
> for instance, and can be desirable.
Correct, but the OP didn't ask for that.
>> 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.
No. You can escape every char you want, even if it's not necessary.
>> or
>>
>> (2) echo preg_replace('/\\ +/', ' ', "here are some \n spaces ");
>>
>
> Searches for the sequence '\ '
No. The double backslash is handled by PHP (see escaping in single-
quoted strings), after then it's just like (1).
BTW: If you want to match a backslash, you'd have to write '\\\\' in the
pattern.
>> or
>>
>> (3) echo preg_replace('/\x20+/', ' ', "here are some \n spaces ");
>>
>
> Ugh!
Perfectly legal and sometimes the only way to define very special
characters.
>> or
>>
>> (4) echo preg_replace('/\\x20+/', ' ', "here are some \n spaces ");
>>
>
> Again, invalid escape sequence.
Again you're wrong, see (2).
> Showing your ignorance again. You do better when you keep your mouth shut.
It's _you_ who should keep the mouth shut in cases like this, especially
if obviously you didn't take the time to test the given examples, but
call them invalid instead. But since they just use different escaping
mechanisms in PHP and the PCRE engine, they're absolutely valid and
useful in different cases.
Micha
--
http://mfesser.de/blickwinkel
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