解析文件和正则表达式

Question

I have a csv file that looks like this:

"2014", "2", "AMC-South", "inpatient", "complication", "1", "2", "2", "13,125.83", "6,562.95"

How can I remove all the quotes and commas separating the items, so it can look like this?:

2014 2 AMC-South inpatient complication 1 2 2 13,125.83 6,562.95

I need this formatting so I can parse the csv file easier (using java). Thanks.

Answer 1

Command line one-liner, using Perl:

$ echo '"2014", "2", "AMC-South", "inpatient", "complication", "1", "2", "2", "13,125.83", "6,562.95"'
"2014", "2", "AMC-South", "inpatient", "complication", "1", "2", "2", "13,125.83", "6,562.95"


$ echo '"2014", "2", "AMC-South", "inpatient", "complication", "1", "2", "2", "13,125.83", "6,562.95"' | perl -pe 's/^"//; s/", "/ /g; s/"$//;'
2014 2 AMC-South inpatient complication 1 2 2 13,125.83 6,562.95

Please note that this will only work correctly for CSV where the fields do not contain white space. That's the reason the CSV has those " around each field.

IMHO you should look for a Java CSV parser module. It will make life much easier in the long run.

Answer 2

Here is algorithm outline:

The java string replace() method returns a string replacing all the old char or CharSequence to new char or CharSequence.

String replaceString = your_string.replace("string_to_replace","[\",]+");

Consider this instead:

replaceAll(String regex, String replacement)

Replaces each substring of this string that matches the given regular expression with the given replacement.

Possible Regex

Answer 3

A work around to avoid the CSV issue since multiple values contain commas, you could split around the following characters ", " . Then all you need to do is remove the first and last " contained within those elements

String[] data = scanner.readLine().split("\", \"");

if(data.length() > 0 && data.length()  <= 10)
{
    data[0].replaceAll("\"", "");
    data[9].replaceAll("\"", "");
}

You could also split around "[\\D+],[\\D+]" and after the array is returned remove any and all " from each string within the array.

Answer 4

Have you considered using a library to parse data? Apache Commons CSV is great for that - https://commons.apache.org/proper/commons-csv/

File csvData = new File("/path/to/csv");
CSVParser parser = CSVParser.parse(csvData, CSVFormat.DEFAULT);
for (CSVRecord record : parser) {
     ...
}

Answer 5

Regex : ",?

Details:

• ? Matches between zero and one times

Java code :

String text = "\"2014\", \"2\", \"AMC-South\", \"inpatient\", \"complication\", \"1\", \"2\", \"2\", \"13,125.83\", \"6,562.95\"";
text = text.replaceAll("\",?", "");

System.out.println(text);

Output:

2014 2 AMC-South inpatient complication 1 2 2 13,125.83 6,562.95