通过Java从sql记录中删除新行

Question

I am reading and manipulating a MS SQL table using JPA. I have text in the cells that I want to cleanup by removing line breaks. Below is one sample of the text (pasting this in notepad++ shows **CR LF** on each line) :

(
(NVSM in (1,2)) and
(NISFVSM in (1,2)) and
(TRMBVSM = 0)
)

I have tried the following code but I can not get rid of the newlines

flatTextString.trim()
        .replace(System.getProperty("line.separator"), " ")
        .replaceAll("\t", "")
        .replaceAll("(\\r|\\n)", "")
        .replaceAll("\\s{2,}", " ")
        ;

How can I fix this?

Answer 1

I suggest just replacing all newline and carriage returns with just a space, and then remove all whitespace before closing ) and after opening ( :

String flatTextString = "(\r\n(NVSM in (1,2)) and\r\n(NISFVSM in (1,2)) and\r\n(TRMBVSM = 0)\r\n)";
System.out.println(flatTextString.replaceAll("[\r\n]+", " ").replaceAll("\\s+\\)", ")").replaceAll("\\(\\s+", "(")); // My way
// => ((NVSM in (1,2)) and (NISFVSM in (1,2)) and (TRMBVSM = 0))

See IDEONE demo

As Java regex cannot use conditional replacement patterns, you can only chain replaceAll methods as I have shown in the code snippet above.