How to replace a part of a string with another part?

Question

I have long String like KA01F332-9:25,KA01F212-9:27,KA01F242-9:35,KA01F232-9:45,. These are combination of vehicle no and time. now I want to replace the time of KA01F242 to 10:20 How can I do this.

So far I hav done this.

String busEAT=KA01F332-9:25,KA01F212-9:27,KA01F242-9:35,KA01F232-9:45,;
busEAT.subString(busEAT.indexOf(vno),busEAT.indexOf(','));

but I am not getting the exact value .and it has to be done dynamically can any one help me in this.

try this -- str = str.replace(str.substring(str.indexOf("KA01F242")+9,str.indexOf("KA01F242")+13),"10:20"); — amit bhardwaj
– amit bhardwaj, Commented Oct 14, 2014 at 12:03
@amitbhardwaj Thanks for ur reply, here +9 and +13 dont work for me. I want it has to be dynamic, so num might be vary . . — Raghu
– Raghu, Commented Oct 14, 2014 at 12:08
try this ----- String string= str.substring(str.indexOf("KA01F242")+9,str.length()); string = string.replace(string.substring(0, string.indexOf(",")), "10:20"); str = str.substring(0, str.indexOf("KA01F242")+9); str = str+string; — amit bhardwaj
– amit bhardwaj, Commented Oct 14, 2014 at 12:23
here + 9 is for KA01F242- and this is fixed according to your requirement — amit bhardwaj
– amit bhardwaj, Commented Oct 14, 2014 at 12:25

TheLostMind · Accepted Answer · 2014-10-14 11:56:24Z

2

You could use regex like this :

    String s = "KA01F332-9:25,KA01F212-9:27,KA01F242-9:35,KA01F232-9:45,";
    System.out.println(s.replaceFirst("(?<=KA01F242-).*?(?=,)", "10:20")); 
   // Positive look-behind for "KA01F242" and positive look-ahead for "," . They are just matched but not captured, so they will not get replaced.

O/P:

KA01F332-9:25,KA01F212-9:27,KA01F242-10:20,KA01F232-9:45,

EDIT :

"(?<=KA01F242-).*?(?=,)", "10:20") --> First looks for any character preceeded by "KA01F242" (positive look-behind), then it selects all the characters ("KA01F242" is just matched, not selected.) Next, all the successive characters are selected until you get a comma (which is agin matched, not selected)

edited Oct 14, 2014 at 11:56

answered Oct 14, 2014 at 11:34

TheLostMind

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