Re: 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@actiu.net> 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 ']'