CODEWITHSUNDEEP
javaregexparsingjava.util.scannerdelimiter
Jorge Israel Peña
Jorge Israel Peña

Reputation: 38586

Regular Expression to Match " | "

I am trying to use Java's useDelimiter method on it's Scanner class to do some simple parsing. Basically each line is a record delimited by " | ", so for example:

2 | John Doe
3 | Jane Doe
4 | Jackie Chan

The method takes as a parameter a regular expression for which to match for. Can someone please provide me with the regular expression that would match | (A vertical bar separated by one space on both sides).

Thanks, I would really appreciate it!

Upvotes: 10

Views: 24079

Answers (5)

Olivier Croisier
Olivier Croisier

Reputation: 6149

Here is a code snippet that parses a string (or a whole File, Scanner accepts both), and extracts the number and name from each line :

String s = 
    "1 | Mr John Doe\n" + 
    "2 | Ms Jane Doe\n" + 
    "3 | Jackie Chan\n";

Pattern pattern = Pattern.compile("(\\d+) \\| ((\\w|\\s)+)");
Scanner scan = new Scanner(s);
while (scan.findInLine(pattern) != null) {
    MatchResult match = scan.match();

    // Do whatever appropriate with the results
    System.out.printf("N° %d is %s %n", Integer.valueOf(match.group(1)), match.group(2));

    if (scan.hasNextLine()) {
        scan.nextLine();
    }
}

This code snippet produces the following result :

N° 1 is Mr John Doe
N° 2 is Ms Jane Doe
N° 3 is Jackie Chan

Upvotes: 4

Sarfraz
Sarfraz

Reputation: 382696

......

^[ \| ]?$

Upvotes: 0

adhanlon
adhanlon

Reputation: 6539

" \| "

would work, you need to escape quotes and the |

Upvotes: 2

Fadrian Sudaman
Fadrian Sudaman

Reputation: 6465

Dont forget to include the * to match repeating character

\S*\s*\|\s*[\S\t ]*

Edited -- You can use simply this too .*\|.*

Upvotes: 0

Jorge Israel Peña
Jorge Israel Peña

Reputation: 38586

I came up with \s\|\s which in Java would be expressed as "\\s\\|\\s". I don't know if this is the best one though. I don't need anything hardcore, just something that works, and this seems to :)

Sorry for answering my own question, I guess after typing it out it helped me think.

Upvotes: 13

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