How to convert ereg_replace('^http://', '', $url)) to a preg_replace expression

[lpccoder]

Hi, this is my first post. As a newbie I am I can't find the correct preg expression to convert a deprecated ereg_replace('^http://', '', $url)) to the correct preg_replace php expression.

Can help me?

 

ereg_replace('^http://', '', $url)) -> preg_replace(???????,'',$url)

 

I have tried without succes preg_replace('/b^http://b/', '', $url) and preg_replace('/^http:///', '', $url)

[JAY6390]

preg_replace('~\bhttp://~i', '', $url);

[lpccoder]

Thanks a lot!!! Solved!!

[.josh]

preg_replace('~\bhttp://~i', '', $url);

 

This is not a direct translation. For one thing, you replaced the start of string anchor tag with a word boundary. Those are not the same thing.  Also, you threw in the case-insensitive modifier...why?  ereg_replace is case-sensitive.  eregi_replace is not.  Your translation will now allow for matches like

 

"....http://"

"  http://"

"]]]]httP://"

"#$htTP://"

etc...

 

Here is a direct translation:

 

preg_replace('~^http://~', '', $url);

 

As a note for migrating from the posix functions (eregxxx) to the pcre functions (pregxxx), 99.99% of the time there is no change needed to the pattern itself.  Basically all you really need to do is throw a delimiter around the pattern (like in this case, ~ was used).  All pregxxx functions must have delimiters around the patterns because pattern modifiers go in the pattern string too.  "~pattern~modifier"  The delimiter can be most any non-alphanumeric character, but  /.../  ~...~ #...# and !...! are the ones I see most commonly used.  Just remember whatever delimiter you choose to use, you must escape it if you need to use that character in the pattern itself (for this reason I avoid using / as delimiter because that comes up a lot in parsing html. For example, if / was used on your pattern, it would have looked like this: '/^http:\/\//'  not as clear, right?).

 

And for ereg vs. eregi, a pattern modifier is used instead of a separate function (the "i" that JAY added after the ending delimiter).