This script is capable of parsing a snapnames text file to create a new text file that contains a list of domain names 6 characters in length or less.

parsing

// Get access to the file system
fs = require('fs');

// Grab the text file
var lines = fs.readFileSync('./snapnames.txt', 'utf8')
              .replace(/([^\dA-z\.\-])+(\s+\S+\s+)/g, ',')  // trim the file
              .split(','),                                  // make it into an array
    domains = [];

// Parse each item in the array
for (i = 0; i < lines.length; i++) {
  // Exclude the TLD
  var domainName = lines[i].split('.');
  // If the domain's length is less than 6 characters...
  if (domainName[0].length <= 6) {
    // ...add it to the `domains` array
    domains.push(lines[i]);
  }
}

// Return a list of domain names that are less than 6 characters long
fs.writeFileSync('./snapnames-lessthan5.txt', domains.join('\n'));