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JAVA, Servlet, Design Pattern
In this blog post, I would like to share the latest news and changes made to Regular Expressions in modern ABAP, mainly from OP release 7.55 \u0026 7.56. Previously, POSIX style regular expressions or “Portable Operating System Interface for uniX” was used in ABAP. Hence, from now on, regular expressions in POSIX syntax are obsolete, then using this kind of regular expressions syntax leads to a warning from the syntax check. Although this can be hidden by the pragma ##regex_posix, it is strongly recommended to migrated to the other regular expression syntax supported by ABAP like PCRE regular expressions, XPath regular expressions or XSD regular expressions. Recap on RegEx Regular expressions, or regex as they’re commonly called, are usually complicated and intimidating for new users. Before digging into the new features, I would like to give a short introduction on RegEx in general \u0026 presenting examples which is explicitly written in ABAP. Those of you who are an expert of this topic and might be get bored, please feel free to skip this section ahead. RegEx concept is around for quite some time. It is used when complex patterns are expected. Like searching for numbers, alphabets, special characters or validating an Email etc. Many text search and replacement problems are difficult to handle without using regular expression pattern matching. Also, in ABAP, a search using a regular expression is more powerful than traditional SAP patterns. Let’s take this simple example: FIND ‘A’ IN ‘ABCD1234EFG’ MATCH COUNT sy-tabix. WRITE: sy-tabix. Now if you want to find all alphabets in the string without using RegEx and by means of normal search pattern, you need a loop over all the 26 characters. Using RegEx, it would be easy to search and find all the seven character: FIND ALL OCCURRENCES OF PCRE ‘[A-Z]’ IN ‘ABCD1234EFG’ MATCH COUNT sy-tabix. WRITE: sy-tabix. ABAP supports Regex in the statements FIND and REPLACE and via the classes CL_ABAP_REGEX and CL_ABAP_MATCHER. Class CL_ABAP_MATCHER applies a regular expression generated using CL_ABAP_REGEX to either a character string or an internal table. Regular Expressions are generally composed of symbols and characters (literals). I try to cover some of the commonly used symbols in the table below. Special Character Meaning \\ Escape character for special characters \\. Placeholder for any single character \\d Placeholder for any single digit [] Definition of a value set for single characters [ – ] Definition of a range in a value set for single characters ? One or no single characters * Concatenation of any number of single characters including ‘no characters’ + Concatenation of any number of single characters excluding ‘no characters’ | Linking of two alternative expressions ^ Anchor character for the start of a line $ Anchor character for the end of a line \\\u003c Start of a word \\\u003e End of a word \\b Start or end of a word \\w matches any letter, digit and underscore
character \\s matches a whitespace character — that is, a space or tab From what mentioned above, we can write regular expressions like this: \\w{5} matches any five-letter word or a five-digit number. a{5} will match “aaaaa”. \\d{11} matches an 11-digit number such as a phone number. [a-z]{3,} will match any word with three or more letters such as “cat”, “room” or “table. Or, for example, the expression c+at will match “cat”, “ccat” and “ccccccat” while the expression c*at will match “at”, “cat” , “ccat” and “ccccccat”. More symbols can be found in ABAP documentation. Greedy or Lazy? Another concept which might be interesting to know is the meaning of greedy or lazy quantifiers in RegEx. In the greedy mode defined with (*,+,…) a quantified character is repeated as many times as it possible. The RegEx engine adds to the match as many characters as it can and then shortens that one by one in case the rest of the pattern doesn’t match. Its opposite will be called the lazy mode which match as few characters as possible. Means for example in ABAP, by placing a question mark after the * , (.*?), you ask to make a subexpression match as few characters as possible. The default behaviour of regular expressions is to be greedy (in fact POSIX imply greedy quantifier which cannot be switched off). Example DATA(text) = `\
Pocket Reference (O’Reilly): Regular Expression Pocket Reference : Regular Expressions for Perl, Ruby, Php, Python, C, Java and .Net (Edition 2) (Paperback)
Concise and easy to use, this handy guide offers programmers a complete overview of the syntax and semantics of regular expressions, which are at the heart of every text-processing application. This handy little book offers programmers a complete overview of the syntax and semantics of regular expressions that are at the heart of every text-processing application. Ideal as a quick reference, Regular Expression Pocket Reference covers the regular expression APIs for Perl 5.8, Ruby (including some upcoming 1.9 features), Java, PHP, .NET and C#, Python, vi, JavaScript, and the PCRE regular expression libraries. This concise and easy-to-use reference puts a very powerful tool for manipulating text and data right at your fingertips. Composed of a mixture of symbols and text, regular expressions can be an outlet for creativity, for brilliant programming, and for the elegant solution. Regular Expression Pocket Reference offers an introduction to regular expressions, pattern matching, metacharacters, modes and constructs, and then provides separate sections for each of the language APIs, with complete regex listings including: Supported metacharacters for each language API Regular expression classes and interfaces for Ruby, Java, .NET, and C# Regular expression operators for Perl 5.8 Regular expression module objects and functions for Python Pattern-matching functions for PHP and the vi editor Pattern-matching methods and objects for JavaScript Unicode Support for each of the languages With plenty of examples and other resources, Regular Expression Pocket Reference summarizes the complex rules for performing this critical text-processing function, and presents this often-confusing topic in a friendly and well-organized format. This guide makes an ideal on-the-job companion. This handy little book offers programmers a complete overview of the syntax and semantics of regular expressions that are at the heart of every text-processing application. Ideal as a quick reference, Regular Expression Pocket Reference covers the regular expression APIs for Perl 5.8, Ruby (including some upcoming 1.9 features), Java, PHP, .NET and C#, Python, vi, JavaScript, and the PCRE regular expression libraries. This concise and easy-to-use reference puts a very powerful tool for manipulating text and data right at your fingertips. Composed of a mixture of symbols and text, regular expressions can be an outlet for creativity, for brilliant programming, and for the elegant solution. Regular Expression Pocket Reference offers an introduction to regular expressions, pattern matching, metacharacters, modes and constructs, and then provides separate sections for each of the language APIs, with complete regex listings including: Supported metacharacters for each language API Regular expression classes and interfaces for Ruby, Java, .NET, and C# Regular expression operators for Perl 5.8 Regular expression module objects and functions for Python Pattern-matching functions for PHP and the vi editor Pattern-matching methods and objects for JavaScript Unicode Support for each of the languages With plenty of examples and other resources, Regular Expression Pocket Reference summarizes the complex rules for performing this critical text-processing function, and presents this often-confusing topic in a friendly and well-organized format. This guide makes an ideal on-the-job companion.
Tecnologia
Programming Perl (Edition 4) (Paperback)
The 4th edition has been thoroughly updated for version 5.14, with details on regular expressions, support for UNICODE, threads, and many other features. Many Perl books explain typeglobs, pseudohashes, and closures, but only this one shows the motivations behind these features and why they work the way they do. Adopted as the undisputed Perl bible soon after the first edition appeared in 1991, Programming Perl is still the go-to guide for this highly practical language. Perl began life as a super-fueled text processing utility, but quickly evolved into a general purpose programming language that’s helped hundreds of thousands of programmers, system administrators, and enthusiasts, like you, get your job done. In this much-anticipated update to the Camel, three renowned Perl authors cover the language up to its current version, Perl 5.14, with a preview of features in the upcoming 5.16. In a world where Unicode is increasingly essential for text processing, Perl offers the best and least painful support of any major language, smoothly integrating Unicode everywhere–including in Perl’s most popular feature: regular expressions. Important features covered by this update include: New keywords and syntax I/O layers and encodings New backslash escapes Unicode 6.0 Unicode grapheme clusters and properties Named captures in regexes Recursive and grammatical patterns Expanded coverage of CPAN Current best practices • Author: Tom Christiansen,Brian D Foy,Larry Wall,Jon Orwant • ISBN:9780596004927 • Format:Paperback • Publication Date:2012-03-13
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Specifications Suggested Age: 22 Years and Up Number of Pages: 168 Genre: Computers + Internet Sub-Genre: System Administration Format: Paperback Publisher: No Starch Press Book theme: General Author: Peteris Krumins Language: English Street Date : November 26, 2013 TCIN : 85685861 UPC : 9781593275204 Item Number (DPCI) : 247-04-9310 Origin : Made in the USA or Imported Description About the Book \
