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copied!<p>The most efficient way would be to write a FilterReader that replaces the starting and ending strings while you are reading the file. I don't see the need for a regular expression to replace static data. The following code could do the trick:</p> <pre><code>public class ReplaceFilterReader extends Reader { private String match; private String replace; private BufferedReader in; private boolean matched; private int currentPos; private boolean end = false; public ReplaceFilterReader(Reader in, String match, String replace) { this.in = new BufferedReader(in); this.matched = false; this.currentPos = 0; this.match = match; this.replace = replace; } @Override public int read(CharBuffer target) throws IOException { int len = target.remaining(); char[] cbuf = new char[len]; int n = read(cbuf, 0, len); if (n > 0) { target.put(cbuf, 0, n); } return n; } @Override public int read(char[] cbuf) throws IOException { return this.read(cbuf, 0, cbuf.length); } @Override public int read() throws IOException { char cb[] = new char[1]; if (this.read(cb, 0, 1) == -1) { return -1; } else { return cb[0]; } } private int readNext() throws IOException { int result = 0; if (!matched) { this.in.mark(match.length()); char cb[] = new char[match.length()]; int n = this.in.read(cb); if (n>0) { String s = new String(cb); if (s.equals(match)) { this.matched = true; if (replace.length()>0) { result = replace.charAt(currentPos); currentPos+=1; if (currentPos == replace.length()) { this.matched = false; this.currentPos = 0; } } else { this.matched = false; this.currentPos = 0; result = 0; } } else { this.in.reset(); result = this.in.read(); } } else { result = n; } } else { result = replace.charAt(currentPos); currentPos+=1; if (currentPos == replace.length()) { this.matched = false; this.currentPos = 0; } } return result; } @Override public int read(char[] cbuf, int off, int len) throws IOException { if (end) { return -1; } int n = 0; int read = 0; for (int i=0; i<len && n!=-1; i++) { n = this.readNext(); if (n!=-1 && n!=0) { read += 1; cbuf[off+i] = (char) n; } else if (n==0) { i = i-1; } } if (n == -1) { end = true; } return read; } @Override public void close() throws IOException { this.in.close(); } } </code></pre> <p>And you would proceed like this:</p> <pre><code>Reader yourReader = // open file ... Reader replaceStart = new ReplaceFilterReader(yourReader,"@@GOTO:\"",""); Reader replaceEnd = new ReplaceFilterReader(replaceStart,"\"@@",""); </code></pre>

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