Preg_replace explain this code

[sowmiya]

$file=file("templates/index.html");

$rcontent=join("",$file);

$rcontent=preg_replace("/{{(.*?)}}/e","$$1",$rcontent); // explain regular expression slone

print $rcontent;

[salathe]

It looks for anything enclosed in double-curly-braces (e.g. {{foobar}}) and replaces that with the value in the associated variable (e.g. $foobar).  It's a very, very awful and crude token-replacement system.

[sowmiya]

Repeats the previous item zero or more times. Lazy, so the engine first attempts to skip the previous item, before trying permutations with ever increasing matches of the preceding item.

 

for eg:

".*?" matches "def" in abc "def" "ghi" jkl

 

http://www.regular-expressions.info/reference.html

[.josh]

Repeats the previous item zero or more times. Lazy, so the engine first attempts to skip the previous item, before trying permutations with ever increasing matches of the preceding item.

 

for eg:

".*?" matches "def" in abc "def" "ghi" jkl

 

http://www.regular-expressions.info/reference.html

 

Which is effectively the same thing as saying "looks for anything enclosed in double-curly-braces"  which salathe's description is overall better because he was explaining the code overall, not just a single bit of the actual pattern.  If all you wanted to know was that specific thing, next time be more specific in explaining what you want to know.