Case-Sensitive String Support in ABNF

This RFC 7405 was published in 2014.

Abstract

This document extends the base definition of ABNF (Augmented Backus- Naur Form) to include a way to specify US-ASCII string literals that are matched in a case-sensitive manner.

RFC 7405 introduction

The base definition of ABNF (Augmented Backus-Naur Form) supports US- ASCII string literals.
The matching of these literals is done in a case-insensitive manner.
While this is often the desired behavior, in some situations, case-sensitive matching of string literals is needed.
Literals for case-sensitive matching must be specified using the numeric representation of those characters, which is inconvenient and error prone both to write and read.

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