java 在字符串中搜索单引号并将其用其他字符包裹
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search for a single quotes in a string and wrap it with other characters
提问by ahaneo
I am trying to parse a csv file and in the process have come across some entries that contain single quotes. I have written the following regex to match more than one match of single quotes, iF the method returns true I am planning to wrap it in another set of characters however I am not getting the correct output
我正在尝试解析一个 csv 文件，并且在此过程中遇到了一些包含单引号的条目。我编写了以下正则表达式来匹配多个单引号匹配项，如果该方法返回 true 我打算将其包装在另一组字符中，但是我没有得到正确的输出
Below is the pseudo code:
下面是伪代码：
public boolean containsChar()
{
String inputStr= "Niel O' Brian";
Pattern pattern = Pattern.compile("/'+");
Matcher matcher = pattern.matcher(inputStr);
boolean matchFound = matcher.matches();
return matchFound;
}
回答by Peter Lawrey
I would just use
我只会用
String inputStr= "Niel O' Brian";
return inputStr.contains("'"); // same as your expression.
return inputStr.contains("''"); // I suspect this is what you are looking for.
If you have two consecutive single quotes you may want to replace them with one
如果你有两个连续的单引号，你可能想用一个替换它们
return inputStr.replaceAll("''", "'");
You may want to place the whole string in double quotes if there is a single quote with
如果有一个单引号，您可能希望将整个字符串放在双引号中
public static String quote(String text) {
if (text.contains("\"")
return '"' + text.replaceAll("\"", "\"\"") + '"';
if (text.contains(",") || text.contains("'"))
return '"' + text + '"';
return text;
}
its much neater to place double quotes around the whole field as Excel does.
像 Excel 那样在整个字段周围放置双引号要简洁得多。
回答by Bart Kiers
You need to remove that forward slash. Right now you're searching for a /followed by one or more single quotes.
您需要删除该正斜杠。现在您正在搜索 a/后跟一个或多个单引号。
Also, matches()checks the entire string, you want find()instead.
此外，matches()检查整个字符串，find()而不是你想要的。
... I have written the following regex to match more than one match of single quotes ...
...我编写了以下正则表达式来匹配多个单引号...
The regex '+matches a single quote as well. To match more than one quote, use ''+or the equivalent '{2,}
正则表达式也'+匹配单引号。要匹配多个引号，请使用''+或等效'{2,}
But if all you want is to find exactly two single quotes, I'd go for Peter's suggestion. I'll leave my answer because it explains why your matches()fails.
但是，如果您只想找到两个单引号，我会采纳 Peter 的建议。我会留下我的答案，因为它解释了您matches()失败的原因。
