The “Oslo” Modeling Language

Chapter 9. Text Pattern Expressions

Text pattern expressions perform operations on the sets of possible text values that one or more terms recognize.

9.1 Primary Expressions

A primary expression can be:

• A text literal

• A reference to a syntax or token rule

• An expression indicating a repeated sequence of primary expressions of a specified length

• An expression indicating any of a continuous range of characters

• An inline sequence of pattern declarations

The following grammar reflects this structure.

Primary:

ReferencePrimary

TextLiteral

RepetitionPrimary

CharacterClassPrimary

InlineRulePrimary

AnyPrimary

9.1.1 Character Class

A character class is a compact syntax for a range of continuous characters. This expression requires that the text ...