CODEWITHSUNDEEP
javaregex
Yinbin Wang
Yinbin Wang

Reputation: 113

Java regex split text (both the delimiter and the order may be unknown)

I'm trying to split a text like "name:jack,berk,john;teacher:smith,jan;course:math;" And I hope the result contains 3 sub-strings (or less, depends on the appearance of 'name' 'teacher' 'course'), which is:

But the appearance order of identifiers 'teacher,name,course' is not fixed, it can be 'course ,name, teacher' and it also can lack one or two, just like only has 'name' identifiers.

Also the delimiter between identifiers is not fixed, in the example is ';',but also can be '、\\s,'.

I have tried many times but it not works.

String str = "name:jack,berk,john;teacher:smith,jan;course:math;
str = str.replaceAll("(.*)(.)(name|teacher|course)(.*)(.)(name|teacher|course)(.*)", "$1--$3$4--$6$7");
System.out.println(str);

Any suggestions would be appreciated.

Upvotes: 3

Views: 297

Answers (4)

anubhava
anubhava

Reputation: 784958

EDIT: Regex without looking for a specific delimiter.

Rather than splitting the string do a match on this regex:

(name|teacher|course):(.+?)(?=\W*(?:name|teacher|course|$))

Working Demo

Code:

Pattern p = Pattern.compile("(name|teacher|course):(.+?)(?=\\W*(?:name|teacher|course|$))");
Matcher m = p.matcher(name:jack,berk,john;teacher:smith,jan;course:math;);
while (m.find()) {
   System.out.println(m.group(1) + " :: " + m.group[2]);
}

Upvotes: 4

shmosel
shmosel

Reputation: 50716

str.split("[、;,\\s](?=name|teacher|course|$)")

Upvotes: 0

user3453226
user3453226

Reputation:

You can replace all the delimiters with an unique delimiter and then use String.split.

String input = "name:jack,berk,john;teacher:smith,jan-course:math;";
String uniqueDelimiter = ";";
String[] otherDelimiters = new String[2];
otherDelimiters[0] = "\\s";
otherDelimiters[1] = "-";
for (String delimiter : otherDelimiters) {
    input = input.replaceAll(delimiter, uniqueDelimiter);
}
String[] keyList = input.split(uniqueDelimiter);

Upvotes: 0

TheLostMind
TheLostMind

Reputation: 36304

public static void main(String[] args) {
    String str = "name:jack,berk,john;teacher:smith,jan;course:math;";
    String[] values = str.split(";");

    for (String s : values) {
        if (s.contains("name:")) {
            System.out.println("name : " + s.replaceAll("name:", ""));
        } else if (s.contains("teacher:")) {
            System.out.println("teacher : " + s.replaceAll("teacher:", ""));
        } else if (s.contains("course:")) {
            System.out.println("course : " + s.replaceAll("course:", ""));
        }
    }
}

O/P :

name : jack,berk,john
teacher : smith,jan
course : math

Upvotes: 1

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