正则表达式划分CSV

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《精通正则表达式》 第401页

public static List splitCSV(String txt) {

String reg = " \\G(?:^|,)(?:\"([^\"]*+(?:\"\"[^\"]*+)*+)\"|([^\",]*+))";
// 即 \G(?:^|,)(?:"([^"]*+(?:""[^"]*+)*+)"|([^",]*+))

Matcher matcherMain = Pattern.compile(reg).matcher("");
Matcher matcherQuoto = Pattern.compile(" \"\"").matcher("");

matcherMain.reset(txt);
System.out.println(matcherMain.groupCount());
List strList = new ArrayList();
while (matcherMain.find()) {
String field;
if (matcherMain.start(2) >= 0) {
field = matcherMain.group(2);
} else {
field = matcherQuoto.reset(matcherMain.group(1)).replaceAll("\"");
}
strList.add(field);
}
return strList;
}

//测试
public static void main(String[] args) {
String txt = " The Thousand,10000,2700,\"10,000\",\"It's \"\"10 Grand\"\",baby\",10K ";
//即 The Thousand,"10,000","It's ""10 Grand"",baby",10K
List splits = splitCSV(txt);
for (String s : splits) {
System.out.println(s);
}
}

打印:
2
The Thousand
10000
2700

10,000
It's "10 Grand",baby
10K
原文链接:https://www.f2er.com/regex/361703.html

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