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===== RFC7405 - Case-Sensitive String Support in ABNF =====
[[dido:public:ra:xapend:xapend.b_stds:tech:ietf:start| return to the IETF Standards ]]

<table>
<caption>Data sheet for RFC7405 Case-Sensitive String Support in ABNF (ABNF)</caption>
| Title                      | Case-Sensitive String Support in ABNF |
| Acronym                    | ABNF |
| Version                    | 2014 |
| Document Number            | RFC7405 |
| Release Date               | December 2014  |
| Reference                  | [[https://tools.ietf.org/html/rfc7405]] |
</table>

  : **Note**: The following is an excerpt from the official IETF RFC. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.


==== Introduction ====
//The base definition of ABNF (Augmented Backus-Naur Form) supports [[dido:public:ra:xapend:xapend.a_glossary:a:ascii|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.//

//This document extends ABNF to have two different types of [[dido:public:ra:xapend:xapend.a_glossary:a:ascii|US-ASCII]] string literals.  One type is matched using case-sensitive matching, while the other is matched using case-insensitive matching.  These types are denoted using type prefixes similar to the type prefixes used with numeric values.  If no prefix is used, then case-insensitive matching is used (as is consistent with previous behavior).//

//This document is structured as a set of changes to the full ABNF specification [ [[dido:public:ra:xapend:xapend.b_stds:tech:ietf:5234]] ].//

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