CODEWITHSUNDEEP
javaregex
Samy
Samy

Reputation: 121

java regex key: value multiple lines

I have this kind of texts:

:33: 88 app 2/8 superman taman, puchong 36100, Malaysia

:22: bla bla \bla /bla bla bla

:32: 45//dsfd//qdsfqsdf

:72D: Example

This example has a form :key:value. Value can be on one or multiline.

I tried the regex (:[0-9]{2}[A-Z]?:)(.*) but I got just the first line in the multiline value. When I try the option Pattern.DOTALL, the result contains all the text for the first key.

What should be the correct Regex?

Upvotes: 2

Views: 290

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627022

You may use

(?m)^(:\d{2}[A-Z]?:)(.*(?:\r?\n(?!:\d{2}[A-Z]?:).*)*)

See the regex demo. Do not use Pattern.DOTALL.

Details

  • (?m)^ - matches the start of a line
  • (:\d{2}[A-Z]?:) - Group 1:
    • : - a colon
    • \d{2} - 2 digits
    • [A-Z]? - 1 or 0 uppercase ASCII letters
    • : - a colon
  • (.*(?:\r?\n(?!:\d{2}[A-Z]?:).*)*) - Group 2:
    • .* - the rest of the line (0 or more chars other than line break chars)
    • (?:\r?\n(?!:\d{2}[A-Z]?:).*)* - zero or more sequences of:
      • \r?\n(?!:\d{2}[A-Z]?:) - a line break (\r?\n in Java 8 should be replaced with \R) that is not followed with the pattern as used in Group 1
      • .* - the rest of the line

In Java, use

String pat = "(?m)^(:\\d{2}[A-Z]?:)(.*(?:\r?\n(?!:\\d{2}[A-Z]?:).*)*)";

See Java demo:

String s = ":33: 88 app 2/8\nsuperman taman, puchong\n36100, Malaysia\n:22: bla bla \\bla /bla\nbla bla\n:32: 45//dsfd//qdsfqsdf\n:72D: Example";
Pattern pattern = Pattern.compile("(?m)^(:\\d{2}[A-Z]?:)(.*(?:\r?\n(?!:\\d{2}[A-Z]?:).*)*)");
Matcher matcher = pattern.matcher(s);
while (matcher.find()){
    System.out.println("--- NEXT PAIR ---"); 
    System.out.println("Key:" + matcher.group(1));
    System.out.println("Value:" + matcher.group(2)); 
}

Output:

--- NEXT PAIR ---
Key::33:
Value: 88 app 2/8
superman taman, puchong
36100, Malaysia
--- NEXT PAIR ---
Key::22:
Value: bla bla \bla /bla
bla bla
--- NEXT PAIR ---
Key::32:
Value: 45//dsfd//qdsfqsdf
--- NEXT PAIR ---
Key::72D:
Value: Example

Upvotes: 3

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