[英]How to replace all special characters with another character in java?
我想用Java中的特殊字符替换所有“特殊字符”
例如,“ cash&carry”将变为“ cash + carry”,并且“ cash $ carry”将变为“ cash + carry”
我有一个示例CSV文件
此处的CSV标头是“ What”和“ Where”
What,Where
salon,new+york+metro
pizza,los+angeles+metro
crate&barrel,los+angeles+metro
restaurants,los+angeles+metro
gas+station,los+angeles+metro
persian+restaurant,los+angeles+metro
car+wash,los+angeles+metro
book store,los+angeles+metro
garment,los+angeles+metro
"cash,carry",los+angeles+metro
cash&carry,los+angeles+metro
cash carry,los+angeles+metro
预期产量
What,Where
salon,new+york+metro
pizza,los+angeles+metro
crate+barrel,los+angeles+metro
restaurants,los+angeles+metro
gas+station,los+angeles+metro
persian+restaurant,los+angeles+metro
car+wash,los+angeles+metro
book+store,los+angeles+metro
garment,los+angeles+metro
cash+carry,los+angeles+metro
cash+carry,los+angeles+metro
cash+carry,los+angeles+metro
示例代码如下
String csvfile="BidAPI.csv";
try{
// create the 'Array List'
ArrayList<String> What=new ArrayList<String>();
ArrayList<String> Where=new ArrayList<String>();
BufferedReader br=new BufferedReader(new FileReader(csvfile));
StringTokenizer st=null;
String line="";
int linenumber=0;
int columnnumber;
int free=0;
int free1=0;
while((line=br.readLine())!=null){
linenumber++;
columnnumber=0;
st=new StringTokenizer(line,",");
while(st.hasMoreTokens()){
columnnumber++;
String token=st.nextToken();
if("What".equals(token)){
free=columnnumber;
System.out.println("the value of free :"+free);
} else if("Where".equals(token)){
free1=columnnumber;
System.out.println("the value of free1 :"+free1);
}
if(linenumber>1){
if (columnnumber==free){
What.add(token);
} else if(columnnumber==free1){
Where.add(token);
}
}
}
}
// converting the 'What' Array List to array
String[] what=What.toArray(new String[What.size()]);
// converting the 'Where' Array List to array
String[] where = Where.toArray(new String[Where.size()]);
for(int i=0;i<what.length;i++){
String data = what[i].replaceAll("[^A-Za-z0-9\",]| (?!([^\"]*\"){2}[^\"]*$)", "+").replace("\"", "");
System.out.println(data);
System.out.println(where[i]);
String finaldata = data+where[i];
String json = readUrl(desturl);
br.close();
}catch(Exception e){
System.out.println("There is an error :"+e);
}
应该删除所有特殊字符,所有空格和双引号,并按照所需的输出进行替换。
我正在使用value.replaceAll("[^A-Za-z0-9 ]", "+")
,但是它不起作用。
错误
cash
carry"
任何帮助表示赞赏。 正则表达式新手。
你需要:
尝试这个:
line = line.replaceAll("[^A-Za-z0-9\",]|,(?!(([^\"]*\"){2})*[^\"]*$)", "+").replace("\"", "");
我认为您的正则表达式非常接近。 还要为逗号添加一个例外,并删除空格,您会很好。
BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
String line;
while ((line = r.readLine()) != null)
{
String replaced = line.replace("\"", "");
replaced = replaced.replaceAll("[^A-Za-z0-9,]", "+");
System.out.println(replaced);
}
当然,字符串在Java中是不可变的。 记住这一点。 replaceAll()
返回一个新的String,并且不修改原始实例。
您需要先找到引号,
在其中用+
替换。 接下来,你可以只使用replaceAll("[^A-Za-z0-9,]", "+")
所以你将取代所有非字母数字字符或者,
用+
。 您的代码可以使用
Pattern p = Pattern.compile("\"([^\"]*)\"");
模式定位报价和appendReplacement
, appendTail
从匹配器类,以取代它的新版本报价成立。
简而言之,您的代码可能看起来像
Scanner scanner = new Scanner(new File(csvfile));
Pattern p = Pattern.compile("\"([^\"]*)\"");
StringBuffer sb = new StringBuffer();
while(scanner.hasNextLine()){
String line = scanner.nextLine();
Matcher m = p.matcher(line);
while (m.find()){//find quotes
//and replace their content with content with replaced `,` by `+`
//BTW group(1) holds part of quotation without `"` marsk
m.appendReplacement(sb, m.group(1).replace(',', '+'));
}
m.appendTail(sb);//we need to also add rest of unmatched data to buffer
//now we can just normally replace special characters with +
String result = sb.toString().replaceAll("[^A-Za-z0-9,]", "+");
//after job is done we can use result, so lest print it
System.out.println(result);
//lets not forget to reset buffer for next line
sb.delete(0, sb.length());
}
回答问题
String csvfile="BidAPI.csv";
try{
// create the 'Array List'
ArrayList<String> What=new ArrayList<String>();
ArrayList<String> Where=new ArrayList<String>();
BufferedReader br=new BufferedReader(new FileReader(csvfile));
StringTokenizer st=null;
String line="";
int linenumber=0;
int columnnumber;
int free=0;
int free1=0;
while((line=br.readLine())!=null){
line =line.replaceAll("[^A-Za-z0-9\",]|,(?!(([^\"]*\"){2})*[^\"]*$)", "+").replace("\"", "");
linenumber++;
columnnumber=0;
st=new StringTokenizer(line,",");
while(st.hasMoreTokens()){
columnnumber++;
String token=st.nextToken();
if("What".equals(token)){
free=columnnumber;
System.out.println("the value of free :"+free);
} else if("Where".equals(token)){
free1=columnnumber;
System.out.println("the value of free1 :"+free1);
}
if(linenumber>1){
if (columnnumber==free){
What.add(token);
} else if(columnnumber==free1){
Where.add(token);
}
}
}
}
// converting the 'What' Array List to array
String[] what=What.toArray(new String[What.size()]);
// converting the 'Where' Array List to array
String[] where = Where.toArray(new String[Where.size()]);
for(int i=0;i<what.length;i++){
String data = what[i].replaceAll("[^A-Za-z0-9\",]| (?!([^\"]*\"){2}[^\"]*$)", "+").replace("\"", "");
System.out.println(data);
System.out.println(where[i]);
String finaldata = data+where[i];
String json = readUrl(desturl);
br.close();
}catch(Exception e){
System.out.println("There is an error :"+e);
}
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