Java regex match not working as expected

Question

I am having a String:

String str = "sourceType=Match, msg=Event yyuyu, test 1, usrPicture=null, friendCount=0";

Now I am writing a regex expression to replace value for "msg" with "...." My regex looks like:

str.replaceAll("(\\smsg=)(.+?)(,)", "$1...$3");

As per my above regex it matches till:

msg=Event yyuyu,

but I want it to match till:

msg=Event yyuyu, test 1,

Basically It should match till last "," (By this I mean it should match till last "," for value of key "msg"). I tried to put some regex after (,). But it's not working. Any help on this will be really appreciated.

@Tushar as per your regex it matches till: msg=Event yyuyu, test 1, usrPicture= — Delhi Bravo
– Delhi Bravo, Commented Mar 2, 2017 at 4:29

RaR · Accepted Answer · 2017-03-02 05:35:31Z

3

The problem is, you are saying to match as minimum characters as possible by adding ? in (.+?). Try removing it.

 str.replaceAll("(\\smsg=)(.+)(,)", "$1...$3");

Moreover, you mentioned you want to match till last , so it should match till

msg=Event yyuyu, test 1, usrPicture=null,

not till

msg=Event yyuyu, test 1,

as you specified in your question.

See this https://regex101.com/r/BCNsTt/1

answered Mar 2, 2017 at 5:35

RaR

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Abdul Hameed · Accepted Answer · 2017-03-02 05:56:23Z

0

If you want to match till the next attribute (usrPicture) as in your example, not as in your question, then you can try the following regex

(\smsg=)(.+?)(,)(\s\w+=)

Replace with $1...$3$4

Output:

sourceType=Match, msg=..., usrPicture=null, friendCount=0

Demo can be found here

answered Mar 2, 2017 at 5:56

Abdul Hameed

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