regex - Java :: Parsing a multiline text with regular expressions -


i want parse multiline text, wrote this:

string text = "[timestamp1] info - message1 \r\n"             + "[timestamp2] error - message2 \r\n"             + "[timestamp3] info - message3 \r\n"             + "message3_details1......... \r\n"             + "message3_details2 ......... \r\n"; string regex = "\\[(.*)\\] (.*) - (.*)"; pattern p = pattern.compile(regex, pattern.dotall); matcher m = p.matcher(text); while (m.find()) {     system.out.println("g1: " + m.group(1));     system.out.println("g2: " + m.group(2));     system.out.println("g3: " + m.group(3));     system.out.println(); }

what want this:

g1: timestamp1 g2: info g3: message1  g1: timestamp2 g2: error g3: message2  g1: timestamp3 g2: info g3: message3     message_details1....     message_details2...

but this:

g1: timestamp1] info - message1     [timestamp2] error - message2     [timestamp3 g2: info g3: message3     message3_details1........     message3_details2........

i'm not able solve google's help.

you have used greedy quantifier in regex. so, .* in [(.*)] consume till last found ]. need use reluctant quantifier. add ? after .*.

also, last .*, need use look-ahead, make stop before next [.

the following code work:

string text = "[timestamp1] info - message1 \r\n"             + "[timestamp2] error - message2 \r\n"             + "[timestamp3] info - message3 \r\n"             + "message3_details1......... \r\n"             + "message3_details2 ......... \r\n";  string regex = "\\[(.*?)\\] (.*?) - (.*?)(?=\\[|$)";  pattern p = pattern.compile(regex, pattern.dotall); matcher m = p.matcher(text); while (m.find()) {     system.out.println("g1: " + m.group(1));     system.out.println("g2: " + m.group(2));     system.out.println("g3: " + m.group(3));     system.out.println(); }

the last part of regex - (.*?)(?=\\[|$) matches till [ in next line, or till end ($). $ required last 2 lines captured in group 3 of last match.

output:

g1: timestamp1 g2: info g3: message1    g1: timestamp2 g2: error g3: message2    g1: timestamp3 g2: info g3: message3  message3_details1.........  message3_details2 .........

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