Java regex replace values

Question

I am trying to replace certain values from a string using java regex

for example the string looks like

:20:1234
    6789
:28G::xyz
|20:3456
    1234
|29C:pqr
:20|9876

I want to replace tag 20 value (may be multi line value) for second occurrence

|20:3456
    1234

with new value(may be multi line value) 6789 so the final replacement string i am expecting is

:20:1234
    6789
:28G::xyz
|20:6789
|29C:pqr
:20|9876

I don't understand your question, but it seems that my answer to your question about a half-hour ago, contains concepts that will also help you here. — aliteralmind
– aliteralmind, Commented Mar 23, 2014 at 4:54

Sabuj Hassan · Accepted Answer · 2014-03-23 08:09:18Z

0

Try this regex:

String str = ":20:1234\n    6789\n:28G::xyz\n|20:3456\n    1234\n|29C:pqr\n:20|9876 \n|20:3456\n    :20:1234\n";
str = str.replaceAll("(\\|20:)[\\s\\S]*?(?=[|:])","$1" + "6789\n");

Here it is checking until it reaches to anything other than | or :, so that it doesn't pick all.

answered Mar 23, 2014 at 8:09

Sabuj Hassan

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PlasmaPower · Accepted Answer · 2014-03-23 16:15:45Z

0

This should work (tested):

str.replaceAll("(\\|" + "20" + ":)[^|:]*\n","$1" + "6789" + "\n");

edited Mar 23, 2014 at 16:15

answered Mar 23, 2014 at 6:03

PlasmaPower

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