I need a regex to match the largest string (inside a string) with at most 5 chars but the last char has to be an X letter.
For example, I want the strings below to be converted to:
abXdef -> abX
abcdX-> abcdX
aXcdXf-> aXcdX
I am using PHP (but you can use any other language, no problem) and so far I came up with this:
preg_replace("/^(.{4})X.+$/","$1","abcdXef");
But it only works if the X is exactly at the fifth position. Any idea how I can fix this?
