How can I take this input CSV file:
0,1
1,2
3,4
5,6,7
8,10
9,10
and return only the substring of each line after the first occurrence of "," so that my output is:
1
2
4
6,7
10
10
I can only figure out how to parse the string within a certain range after splitting by commas, so I am using string.split(",")[1]
to return everything after the first comma and before the next comma but I can't figure out how to get everything after the first comma. So for the inputs with more than one comma, I'm missing data.
你可以做:
line.substring(line.indexOf(",")+1)
There are a couple of different ways of removing everything before the first occurrence of a ,
.
,
and substring using that index. This would look like
String wantedPart = lineOfText.substring(lineOfText.indexOf(",") + 1);
Since indexOf
returns the index of the ,
itself, you need to add one to get everything past it.
String.split(String regex, int limit)
. This overload allows you to match a maximum of limit
substrings. So with a limit of 2, it will split on the first ,
found (and no more). In your code, you could use
String wantedPart = lineOfText.split(",")[1];
If a shell script will do, you can use the cut
command:
-d ','
means use a comma as -f2-
means use fields 2 onwards.
Machine:~ donald$ cat file.txt
0,1
1,2
3,4
5,6,7
8,10
9,10
Machine:~ donald$ cat file.txt | cut -d ',' -f2-
1
2
4
6,7
10
10
Machine:~ donald$
尝试使用String.indexOf(“,”)等。
You can use the overloaded split method which allows to define a limit of substrings.
split(",",1)
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