First, its good to know that PSPads cannot do a multi-line search ATM; its regex search is limited to separate lines and ^ / $ anchors. You may use \n in replace statement and it works ok, so you can split text to multiple lines, but not remove CRLF in regex replace.
For joining lines you may use built-in function found in Menu > Lines Manipulation > Join Lines; if you want multiline search/replace you may try plugin found in http://www.phdesign.com.au/phreplace/ -- <http://forum.pspad.com/read.php?2,58219,58224> PSPad freeware editor http://www.pspad.com
