node/test/fixtures/stdio-filter.js

// Copyright Joyent, Inc. and other Node contributors.
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var util = require('util');

var regexIn = process.argv[2];
var replacement = process.argv[3];
var re = new RegExp(regexIn, 'g');
var stdin = process.openStdin();

stdin.on('data', function(data) {
  data = data.toString();
  process.stdout.write(data.replace(re, replacement));
});