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Re: [PHP] Catch line indetation




El 28/10/16 a les 15:15, Christoph M. Becker ha escrit:
> On 28.10.2016 at 13:09, Ashley Sheridan wrote:
> 
>> On 28 October 2016 12:01:16 BST, Narcis Garcia <informatica@xxxxxxxxx> wrote:
>>
>>> Hello, I have a string (I quote here only) as:
>>>
>>> '   <table>...</table>'
>>>
>>> As you can see there are 3 spaces at the beginning, but it could be 0
>>> or
>>> 4 or any number of spaces.
>>> How can I get a string with only the initial spaces part?
>>>
>>> '   <table>...</table>' -> '   '
>>> 'hello' -> ''
>>> ' hello' -> ' '
>>>
>>> Thanks.
>>
>> Have you tried regular expressions? Something like:
>>
>> ^( )*[^ ]
>>
>> The first captured match is the number of spaces, from 0 to any amount. Not the space between the brackets and before the closing square bracket
> 
> Shouldn't that be
> 
>   ^( *)[^ ]
> 
> instead?
> 

preg_replace('^( *)[^ ]', '${1}', '   <table>...</table>');
Warning: preg_replace(): Unknown modifier ']'

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