[Bug-apl] Not a bug, need help coding search&replace on a vector

[Christian Robert]

Hi, it's not a bug but a request for help,


suppose 
s="^^^This^is^a^^^^test^^with^^^^^lot^of^blanks^^^^at^beginning^and^^^end^^^^^^"
suppose from="^^^"
suppose to="^"

I need a function who can replace ("^^^" to "^"), or ("^" to "^^^^^^^^") or ("" to 
"blabla" with limits of source size)  ie: without being lost in infinite loop.



"s" is a character vector, "from" is a character vector, and "to" is a 
character vector,
both "s", "from" and "to" can be "".



I'm pretty sure this idiom already exist.

if you can help me, please do.

Xtian.