Description:
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If a string contains backslash newline, in any form of input or string building, those characters are removed as if the parser is processing a script line. All other languages that I know of only remove the line continuation if it occurs outside of a string definition and leaves the inside of strings alone (other than normal escape sequences of double quoted strings). php even strips the backslash newline from text submitted through a web form and referenced as $_REQUEST['varname'].

Line continuation characters effected are:

backslash newline
backslash carriage return
backslash equal sign
backslash 0x10

There may be more. I haven't completed testing yet, but will update this bug report if I find more.

Reproduce code:
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I've tried test strings (letter e, backslash, newline, letter e) like:

"e\\\ne" becomes "ee"
'e\'."\n".'e' becomes 'ee'
'e\'.0x0a.'e' becomes 'ee'
"e\\\x0ae" becomes "ee"

you get the idea.

If I [sic] escape the string like this:

"e\\\\\x0a\x0ae" I get the expected [e, backslash, newline, e] string.