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javaregexreplaceall

replaceAll or regex java forward slash

I want to change the string "S/" to "S/." only whole word , I tried with Pattern.compile and Matcher.quoteReplacement. I didn't find the solution.

public static void main(String[] args) {
    String cadena = "Moneda Actual : S/";
    cadena = cadena.replaceAll("\\bS/\\b", "S/.");
    System.out.println(cadena);
}

This code print :

Moneda Actual : S/

I want to print :

Moneda Actual : S/.

So if original text is "Moneda Actual : S/." , the algorithm mustn't replace to "S/.."

Solution

  • Use a negative look ahead:

    cadena = cadena.replaceAll("\\bS/(?!\\.)", "S/.");

    The negative look ahead asserts (without consuming) that the next character is not a dot.

    This will also work then "S/" occurs at the end of the String.

    ——

    There is no word boundary after a slash and before a dot. Word boundaries are between “word” characters (letters, number and the underscore) and non-“word” characters. Not between whitespace and non-whitespace.