CODEWITHSUNDEEP
javaregexstringreplace
Nithesh Kumar
Nithesh Kumar

Reputation: 29

Remove value from String which is comma separated

I am very new to java and was currently having the below requirement.

Whenever i found 12.1 in a string it should be removed but it is conditional. for Eg Below

12.1,ztel,presto should be ztel,presto

12.1 should be replaced as blank

12.1/7.1 should not do anything as it is separate value

I tried doing stringValue.replace("12.1","");

Mostly the requirement is if 12.1 is found comma separated or only 12.1 it should be replaced as blank else not.

The above code was working partially and not working for all conditions.

Please guide and help me learn. Thanks a lot.

Upvotes: 0

Views: 3639

Answers (4)

matt
matt

Reputation: 12346

The first argument of String.replaceAll is a regex. Did you consider,

yourString.replaceAll("12\\.1,?", "");

Now it will only use . and not "any character" as a . would do. It also will match the comma, if present.

If you cannot have it followed by something specific, you can use a negation.

yourString.replaceAll("12\\.1,?[^/]", "");

That would leave 12.1/7.1.

Upvotes: 1

Angga
Angga

Reputation: 2323

if 12.1 that should be replaced as blank is the only word in that string you can use this:

stringValue.replaceAll("^12\\.1$","blank");

then replace again that string with this to replace the one separated with coma:

stringValue.replaceAll("12\\.1,","");

the final code will be like this :

stringValue= stringValue.replaceAll("^12\\.1$","blank").replaceAll("12\\.1,","");

note: ^ mean start of line while $ mean end of a line

Upvotes: 0

benshepherd
benshepherd

Reputation: 725

Sounds like a good use case for a regex! You can try out different regular expressions to match your data at regexr.

I would start with something like

^[\d\.]+,?
  • Start of a line: ^
  • Group [] containing digits \d or dots \. (you have to escape since . is a special character)
  • One or more of these +
  • An optional comma ,?

You'll need to do something about not matching an entry containing a slash / - I'm not sure how to handle that.

Upvotes: 0

sreedhar
sreedhar

Reputation: 326

You can try like this stringValue.replace( "12.1," , ""); Use comma after 12.7 in the first parameter.

Upvotes: 1

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