How to remove all non-alphanumeric characters from a string expect decimal point in Java-CodePudding

Having this String with decimal point, I would like to remove all non alphaNumeric expect the decimal point.

 String toPharse = "the. book - cost 7.55 dollars.";

 String newPharse =  toPharse.replaceAll("[^A-Za-zd.0-9 ]", " ").replaceAll("\\s ", " ");

Currently I get "the. book cost 7.55 dollars.";

However I would like to return "the book cost 7.55 dollars";

CodePudding user response：

You can use:

String toPharse = "the. book - cost 7.55 dollars.";
toPhrase = toPharse
   .replaceAll("(?<!\\d)\\.(?!\\d)|[^a-zA-Z\\d. ] ", "")
   .replaceAll("\\h{2,}", " ");

//=> "the book cost 7.55 dollars"

RegEx Demo

RegEx Details:

(?<!\\d): Previous character is not a digit
\\.: Match a dot
(?!\\d): Next character is not a digit
|: OR
[^a-zA-Z\\d. ] : Match 1 of non-alphanumeric characters that are not space or dot
.replaceAll("\\h{2,}", " "): is for replacing 2 whitespaces with a single space