java - Replace a substring by a changing replacement string -


i'm trying write small program detect comments in code file, , tag them index-tag, meaning tag increasing value.
example input: 

method int foo (int y) {      int temp; // first comment     temp = 63; // second comment     // third comment }

should change to:

method int foo (int y) {      int temp; <tag_0>// first comment</tag>     temp = 63; <tag_1>// second comment</tag>     <tag_2>// third comment</tag> }

i tried following code: 

    string prefix, suffix;     string pattern = "(//.*)";      pattern r = pattern.compile(pattern);     matcher m = r.matcher(filetext);      int = 0;     suffix = "</tag>";      while (m.find()) {         prefix = "<tag_" + + ">";         system.out.println(m.replaceall(prefix + m.group() + suffix));         i++;     }

the output above code is:

method int foo (int y) {      int temp; <tag_0>// first comment</tag>     temp = 63; <tag_0>// second comment</tag>     <tag_0>// third comment</tag> }

to replace occurrences of detected patterns, should use matcher#appendreplacement method fills stringbuffer: 

stringbuffer sb = new stringbuffer(); while (m.find()) {     prefix = "<tag_" + + ">";     m.appendreplacement(sb, prefix + m.group() + suffix);     i++; } m.appendtail(sb); // append rest of contents

the reason replaceall wrong replacement have matcher scan whole string replace every matched pattern <tag_0>...</tag>. in effect, loop execute once.


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