regret

Organize regexes for your app, non-shittily.

Example

var regret = require('regret');

// Register a base ISO date regex you'll want to use in other patterns
regret.add('date.iso',
  /\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d+-[0-5]\d/,
  '2014-02-13T18:00:04.709-0500');

// Use moustaches to use pre-registered patterns
regret.add('mongodb.log', /({{date.iso}}+) \[(\w+)\](?:\s{2})(.*)/,
  '2014-02-13T18:00:04.709-0500 [initandlisten] db version v2.5.6-pre-',
  ['date', 'name', 'message']);

regret.add('mongodb.logShutdown', /(\w+)\:(?:\s{1})(.*)/,
  'dbexit: really exiting now', ['name', 'message']);

// You'll also get nice named captures like you can with `?P<>` in python:
var text = '2014-02-18T14:34:06.272-0500 [clientcursormon]  mapped (incl journal view):320',
  res = regret('mongodb.log', text);

console.log('Log Date: ', new Date(res.date));
// Log Date:  Tue Feb 18 2014 14:34:06 GMT-0500 (EST)

console.log('MongoDB Thread Name: ', res.name);
// MongoDB Thread Name:  clientcursormon


// console.log('Log Message: ', res.message);
Log Message: mapped (incl journal view):320

API

The invention of the Regular Expression is right up there next to antiseptic. How many times have you copy and pasted the email regex? Or even worse, come across a constants/RegularExpressionsImpl.js? I say, enough of this madness. Regular expressions are beautiful things that deserve better. Now, let's all stop copy and pasting validation regexes from stackoverflow, k?

regret.add(name, pattern, example, [capture keys])

Register a new regex pattern with a required example so you don't have to deal with the code-review-haters and an optional array of [capture keys] that give each (<magic>) in your pattern a property name in the result.

regret(name, input)

Match input against a regex you already registered as name and return a nice object with the captures. See you in hell matches[1] matches[2]! Optionally, set name to a regex to test against multiple registered matchers, for example:

res = regret('mongodb.log', 'dbexit: really exiting now');
console.log('result:', res);
// result: null

res = regret(/^mongodb/, 'dbexit: really exiting now');
console.log('result:', res);
// result: {name: 'dbexit', message: 'really exiting now'}

todo

• look for and automatically add regrets from package.json
• make regret-usual-suspects that has all the common crud, like commonregexjs with phone numbers, email (fuck yes!), and other things you just shouldn't have to think about

License

MIT