regex - Java string replacing (remove newlines, change $ to \$) -

i have string ($ character surrounded other characters):

a$b c$d e$f 

i want string method put \ in front of $ , remove newlines:

a\$bc\$de\$f 

i tried doesn't put \ character:

 s=s.replaceall("\n","").replaceall("$", "\\$"); 

$ reserved character in java patterns, indicates end of line or end of input.

you need escape replacement... thrice.

try replaceall("\\$", "\\\\\\$")