I have alot of text files with the folling structure: FileName_Location.txt. Within the textfile there are three values, which i have to replace.
<filename="" location="" extension="">
So it would be <filename="FileName" location="Location" extension="txt">
I get all those values by the filename. But it could also be possible that the values/parameters in the textfile are wrong, so I have to overwrite them.
My problem is how I can exact locate the right positions to add or replace the values.
Here is Java code making heavy use of regular expressions which works on a single line from your original question. It extracts out several groups and then rebuilds the line, inserting the values you want along the way.
String pattern = "^(<filename=)(\".*\")\\s(location=)(\".*\")\\s(extension=)(\".*\">)$";
String input = "<filename=\"\" location=\"\" extension=\"\">";
// you can uncomment this next line to test the case when values be
// already present in the input line
//String input = "<filename=\"stuff\" location=\"stuff\" extension=\"stuff\">";
System.out.println("Input string:");
System.out.println(input);
// you can replace these next 3 variables with whatever values you want
// e.g. you could put this code into a loop
String fileName = "FileName"; // a new filename
String location = "Location"; // a new location
String extension = "txt"; // a new extension
Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(input);
if (m.find()) {
StringBuilder res = new StringBuilder();
res.append(m.group(1)).append("\"").append(fileName).append("\" ");
res.append(m.group(3)).append("\"").append(location).append("\" ");
res.append(m.group(5)).append("\"").append(extension).append("\">");
System.out.println("Output string:");
System.out.println(res);
} else {
System.out.println("NO MATCH");
}
This code has been tested on IntelliJ version 11 (yes I'm too lazy to upgrade) and it works fine.
Output:
Input string:
<filename="" location="" extension="">
Output string:
<filename="FileName" location="Location" extension="txt">
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