search & replace doesnt work with "newlines" in PDF to MOBI conversion

[fred410]

Hello,
(btw, this program is great, have used it on several conversions without issue)
I am trying to convert a PDF to MOBI for a Kindle keyboard (called a 3rd edition, that does 3G and WiFi built in)

Anyway -- on straight conversion - several "paragraph" or "section" headers in PDF get converted with the text squashed together without spaces.
Meaning in pdf file you would see "first second third" but after conversion to MOBI you get "firstsecondthird"

I tried doing "search & replace" in conversion - to no avail -- in my test (screen prints attached) you can see i tried replacing "newline" with a string of letter "j"s -- which didnt happen.

From the "log file" -- I see:
Conversion options changed from defaults:
read_metadata_from_opf: 'C:\\Users\\whatever\\AppData\\Local\\Temp\\calibr e_pxif23tg\\48a3wg9b.opf'
output_profile: 'kindle_pw3'
search_replace: '[["[a-z]\\\\n", "jjj"]]'
verbose: 2
++AND++
'search_replace': '[["[a-z]\\\\n", "jjj"]]',

No other references to "\n" to remove the newline or linefeed.

See attached screen prints for actual screens, "test" results and ebook viewer.

Is this is bug? Or do you have another regular expression that would match the paragraph/section "newlines" that the converter would except?

Thanks for your Help !