Re: Catch line indetation

On 29.10.2016 at 09:45, Narcis Garcia wrote: > 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('^( *)[^ ]', '${1}', ' > <table>...</table>'); > Warning: preg_replace(): Unknown modifier ']' Of course, the pattern has to be enclosed by delimiters, so you could use: preg_replace('/^( *)[^ ]/', '${1}', ' <table>...</table>') -- Christoph M. Becker