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I'm so sick and fucking tired of the shitty sed and grep regex syntax. So i'm sharing a piece of Java code.

import java.io.*;
import java.util.regex.*;

public class Jsed{
    
    public static void main (String args[]) {

    Pattern p = Pattern.compile(args[0]);    
    
    try    {

        InputStream in = System.in;
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        byte[] buf = new byte[4096];
        int b;

        while ((b = in.read(buf)) != -1) {
            out.write(buf, 0,b);
        }

        Matcher m = p.matcher(new String(out.toByteArray()));

        while (m.find()) {
            System.out.println(m.group(1));
        }

    } catch(IOException io){
        io.printStackTrace();
    }    
  }
}

This enables you to use Java's Regex system in a pipe. For ex.

thinkpad :: ~/Documents % tree -if | jsed "(.*\d+_\d+_\d+.*\.jpg)"
./instagram/122252_161113958834_185772_n.jpg
./instagram/108184_164011148759_1532867_n.jpg
./instagram/122913_163463958699_13906354_o.jpg
./instagram/130322_151904900462_226310_n.jpg


Thank me later.