Capture part of a string within a couple of characters using regex

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Capture part of a string within a couple of characters using regex

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#1 by (0 votes)

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I'm trying to solve a problem of exchanging words between <> .

For example, I have the following string: <><PALAVRA outrapalavra>palavra</PALAVRA>

In addition to this string, I get a parameter that indicates which words in the string should be exchanged for a x value, and the case-sensitive between words should be ignored.

In the example example, PALAVRA and palavra are equal to each other and to the parameter, outrapalavra differs from the two and parameter e and should not be changed. I need to change only < PALAVRA > and </ PALAVRA > that are just between the characters <> and </> .

I tried with the following expression <(?parâmetro.*?)> but I was not successful because when executing the <> is removed and everything that is between <> is captured.

If I were just comparing the parameter with the words I would have solved it, but with the restriction of having to ignore case-sensitive I found no other solution than using regex > to find the target word independent of the characters that make it up uppercase or lowercase .

Does anyone have any tips?

java regex

asked by anonymous 29.01.2016 / 19:00

1 answer

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score 0 · Accepted Answer

Try this:

String s = "<><PALAVRA outrapalavra>palavra</PALAVRA>";
String parametro = "palavra";
String replace = "NovaPalavra";

Pattern p = Pattern.compile("<(/?)(.*?)"+parametro+"(.*?)>", Pattern.CASE_INSENSITIVE);
s = p.matcher(s).replaceAll("<$1$2"+replace+"$3>");

System.out.print(s);

replace works like this:

% literal capture%
< if it has
/ anything, as little as possible
.*? word to be replaced
parametro anything, as little as possible
% literal capture%

See Ideone.