i want to replace same words with one of them
"p1 p2 p2 p2 p2 p3 p3 p4 p5 p5 p5 p5 p5 p2 p2 p1 p1 p1"
to change this
"p1 p2 p3 p4 p5 p2 p1"
is there any method in java to do this?
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2 Answers
You can use regex.
String text = "p1 p2 p2 p2 p2 p3 p3 p4 p5 p5 p5 p5 p5 p2 p2 p1 p1 p1";
System.out.println(text.replaceAll("(\\w+)(\\s+\\1)+", "$1"));
output:
p1 p2 p3 p4 p5 p2 p1
(\\w+)will match single word and thanks to parenthesis it will be placed in group 1- in
(\\s+\\1)+\\s+means one or more whitespace and\\1requires same match as from group 1. Surrounding this with(...)+requires this to exist one or more times - as replacement we used
$1which gets match stored in group 1 (so we are replacing many same words with first word).
Comments
Here is one solution:
public static void main(String[] args)
{
String s = "p1 p2 p2 p2 p2 p3 p3 p4 p5 p5 p5 p5 p5 p2 p2 p1 p1 p1";
String[] parts = s.split(" ");
ArrayList<String> arr = new ArrayList<String>();
arr.add(parts[0]); // Add first item
for (int i = 1; i < parts.length; i++) {
if (!parts[i - 1].equals(parts[i])) { // Check if last item is different
arr.add(parts[i]);
}
}
StringBuilder sb = new StringBuilder();
for (String str: arr) { // Creating the new String via StringBuilder
sb.append(str);
sb.append(" ");
}
System.out.println(sb.toString());
}
Output:
p1 p2 p3 p4 p5 p2 p1
2 Comments
Pshemo
Small suggestion. Instead of appending
str+" " use append(str).append(" "). This way you will not have to concatenate two Strings (and use another StringBuilder).
Christian Tapia
@Pshemo thanks for pointing it out. I don't know why I always overlook that.