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Asked: 2026-06-16T16:55:07+00:00

Hi I’m having some problems with php recurring regexp. I have strings like {{if(x=y)?

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Hi I’m having some problems with php recurring regexp. I have strings like
{{if(x=y)? {{ true do something || false do something else }}
in my html files. It will be some kind of basic template engine. If I use 

$matches=array();
$content = "{{if(x=y)? true do something || false do something else }}";
preg_match_all('/\{\{if\((.*?)\)\?(.*?)\|\|(.*?)\}\}/is',$content,$matches);

returns the results as I expected. 

Array(
 [0] => Array
    (
        [0] => {{if(x=y)?
            true do something 
               ||
            false do something else 
               }}
    )
 [1] => Array
    (
        [0] => x=y
    )
 [2] => Array
    (
        [0] => true do something 
    )
 [3] => Array
    (
        [0] => false do something else 
    )
)

But if the pattern is nested with another one like; 

{{if(x=y)?
  {{if(y=z)?
     true do something 
   || 
     false do something else 
  }}
||
  {{if(x=a)?
    true do something 
  || 
   false do something else 
  }}
}}

it takes the first “}}” chars as end of pattern and fails

Array
(
    [0] => Array
    (
        [0] => {{if(x=y)?
            {{if(y=z)?
          true do something 
            ||
          false do something else 
            }}
        )
    [1] => Array
    (
        [0] => x=y
    )
    [2] => Array
    (
        [0] => {{if(y=z)?
    true do something   
    )
    [3] => Array
    (
        [0] => 
    false do something else     
    )
)

I would like to make a recurring regexp so in each part of true or false it should check if the matched content has same pattern again. The logical part of If is already done. I just need a regexp will match the parts so I can loop thru the results.With my Regexp knowledge this is all I could do so far.EDIT
to be more descriptive I need a regexp can parse something like this.

{{if()?{{if()?{{if()?...||...}}||{{if()?...||...}}}}||{{if()?{{if()?...||...}}||{{if()?...||...}}}}}}

but the regexp I used can only catches from first {{if to first }} it finds which returns 

{{if(){{if(){{if()...||...}}

which is correct for the regexp. But how can I rule the regexp as “get whole text, find the block between {{if()? and }} till the end and ignore any others if it is not at the end” or “get the most outer {{if()?||}} block.
Thanks

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1 Answer

  1. Editorial Team

    I solved the problem with using link. Author of the script made it simple enough with a different style. In my sample I was trying to match the code blocks with regexp and replace them with the data, but he actually replaced the code blocks into php codes and recreates the files in a different folder with same structure and each time page requested, first checks the file existence and updated time and runs the script. pretty smart. Maybe not a perfect solution and rational but solves my problem. thanks anyway

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