Skip to content
master
Switch branches/tags
Go to file
Code

Latest commit

- Simplify "( |\t)" to "[ \t]"
- Simplify "foo{0,1}" to "foo?"
- Simplify "foo{2,2}" to "foo{2}"
68219f8

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
 
 
 
 
 
 
 
 
 
 

README.md

ABNF to REGEX Library

The ABNF to REGEX library is a pair of PHP functions that validate standard ABNF (RFC 5234) input and generate POSIX and Perl-compatible regular expressions for use in schema and applications.

I provide an online form front-end for these functions at:

http://abnf.msweet.org/

The file "example.php" shows how to implement your own web form.

Functions

abnf_load(string)

This function parses the ABNF contained in the supplied string. On success, it returns an array of rules that can be passed to the "abnf_regex" function.

FALSE is returned on failure, with the following global variables describing the issue:

  • "abnf_error" contains a string describing the issue.
  • "abnf_errorline" contains the line number in the string where the issue occurred.
  • "abnf_errorcol" contains the column number in the string where the issue occurred.

abnf_regex(rules, rulename, mode = ABNF_INSENSITIVE)

This function generates a regular expression for the named rule. If the named rule does not exist, an empty string is returned.

The "mode" parameter can be any of the following constants:

  • ABNF_INSENSITIVE : Generates a case-insensitive regular expression.
  • ABNF_SENSITIVE : Generates a case-sensitive regular expression.
  • ABNF_LOWERCASE : Generates a case-sensitive regular expression with all string literals converted to uppercase.
  • ABNF_UPPERCASE : Generates a case-sensitive regular expression with all string literals converted to lowercase.

Legal Stuff

Copyright (c) 2013-2019 Michael R Sweet

This software is provided under the terms of the MIT license, which is provided in the file "LICENSE.md".