Email Parse

A fast, RFC-compliant email address validator and parser.

Table of Contents

1. Overview
2. Installation
3. Usage
4. Performance
5. Links
6. Patches
7. License

Overview

Email address validation is deceptively hard.

What is a valid email address? You'll find many different answers for this online, and multiple RFCs that sometimes conflict. RFC 5321 is the authoritative document.

This library complies with RFC 5321 and includes a comprehensive test suite. It provides validation and parsing that's much more robust than most regex-based solutions.

And it's fast.

Installation

Email Parse is available on Ultralisp and is easy to install using Quicklisp.

The system makes heavy use of inline functions to achieve performance. Consequently, compiling it can be memory-hungry. Starting your Lisp implementation with a fair amount of dynamic space is recommended, e.g:

$ sbcl --dynamic-space-size 16384

Add the Ultralisp repository:

CL-USER> (ql-dist:install-dist "http://dist.ultralisp.org/")

Install Email Parse:

CL-USER> (ql:quickload :email-parse)

Usage

You can parse email address strings:

CL-USER> (require :email-parse)
NIL

CL-USER> (email-parse:parse "[email protected]")
"simple"
"example.com"

CL-USER> (email-parse:parse "[email protected]" :plist t)
(:LOCAL-PART "simple" :DOMAIN "example.com")

Or octet sequences:

CL-USER> (require :email-parse)
NIL

CL-USER> (email-parse:parse-octets
          (trivial-us-ascii:ascii-string-code
           '(simple-array (unsigned-byte 8) (*))
           "[email protected]")
          0
          (length "[email protected]"))
"simple"
"example.com"

CL-USER> (email-parse:parse-octets
          (trivial-us-ascii:ascii-string-code
           '(simple-array (unsigned-byte 8) (*))
           "[email protected]")
          0
          (length "[email protected]")
          :plist t)
(:LOCAL-PART "simple" :DOMAIN "example.com")

Performance

Parsing is fairly quick, and runs in linear time, though the parser does cons:

CL-USER> (time (dotimes (c 100000)
                 (email-parse:parse "[email protected]")))
Evaluation took:
  0.152 seconds of real time
  0.151840 seconds of total run time (0.147935 user, 0.003905 system)
  100.00% CPU
  516,269,668 processor cycles
  113,608,576 bytes consed

NIL

CL-USER> (time (dotimes (c 100000)
                 (email-parse:parse-octets
                  (trivial-us-ascii:ascii-string-code
                   '(simple-array (unsigned-byte 8) (*))
                   "[email protected]")
                  0
                  (length "[email protected]"))))
Evaluation took:
  0.152 seconds of real time
  0.148390 seconds of total run time (0.144645 user, 0.003745 system)
  97.37% CPU
  504,555,988 processor cycles
  113,608,592 bytes consed

NIL

Links

• Repository

Patches

Patches are welcome.

License

Email Parse is licensed under the two-clause BSD license.

See LICENSE.