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The following issues are involved in such extensions. Unicode is a large character set—regular expression engines that are only adapted to handle small character sets will not scale well.
Unicode encompasses a wide variety of languages which can have very different characteristics than English or other western European text. There are three fundamental levels of Unicode support that can be offered by regular expression engines: At this level, the regular expression engine provides support for Unicode characters as basic logical units.
This is a minimal level for useful Unicode support. It does not account for end-user expectations for character support, but does satisfy most low-level programmer requirements.
The results of regular expression matching at this level are independent of country or language. At this level, the user of characteristics of technical writing a-z regular expression engine would need to write more complicated regular expressions to do full Unicode processing.
At this level, the regular expression engine also accounts for extended grapheme clusters what the end-user generally thinks of as a characterbetter detection of word boundaries, and canonical equivalence. This is still a default level—independent of country or language—but provides much better support for end-user expectations than the raw level 1, without the regular-expression writer needing to know about some of the complications of Unicode encoding structure.
At this level, the regular expression engine also provides for tailored treatment of characters, including country- or language-specific behavior. For example, the characters ch can behave as a single character in Slovak or traditional Spanish.
The results of a particular regular expression reflect the end-users' expectations of what constitutes a character in their language, and the order of the characters. However, there is a performance impact to support at this level.
Level 1 is the minimally useful level of support for Unicode. All regex implementations dealing with Unicode should be at least at Level 1. Level 2 is recommended for implementations that need to handle additional Unicode features.
This level is achievable without too much effort. However, some of the subitems in Level 2 are more important than others: Level 3 contains information about extensions only useful for specific applications.
Features at this level may require further investigation for effective implementation. One of the most important requirements for a regular expression engine is to document clearly what Unicode features are and are not supported. Even if higher-level support is not currently offered, provision should be made for the syntax to be extended in the future to encompass those features.
The Unicode Standard is constantly evolving: This means that a regular expression that tests for currency symbols, for example, has different results in Unicode 2. At any level, efficiently handling properties or conditions based on a large character set can take a lot of memory.
A common mechanism for reducing the memory requirements—while still maintaining performance—is the two-stage table, discussed in Chapter 5 of The Unicode Standard [ Unicode ].
For example, the Unicode character properties required in RL1. Accessing those properties only takes a small amount of bit-twiddling and two array accesses. For ease of reference, the section ordering for this document is intended to be as stable as possible over successive versions.Korean Art (c.3, BCE onwards): Arts and Crafts of Korea during the Goryeo, Joseon Periods.
This article presents a developmental framework of informational writing developed from a study of children's writing in K-5 classrooms. See examples of children's compositions at each developmental level, and learn how to use this continuum to support increasingly more mature forms of .
Writing well is difficult and time consuming and writing in a technical way about technical subjects even makes it more difficult. People write to propose projects, to document their own actions, to help other understand the research, to analyze and solve problems, to describe procedures and objects.
Start studying Final: 5 traits of Technical Writing.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. Chemical Technology Program Competencies.
Identify potential hazards and apply OSHA safety standards to laboratory operations. Operate, maintain, troubleshoot, and repair laboratory instrumentation in the pursuit of data to be analyzed, summarized, and reported with statistical analysis.
Harry Potter Inspires: Character Sketch for a New Wizard In this writing and literature lesson for grades , students create a new character that would fit into the wizard world.