RegEx Parsing

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RegEx Parsing
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Overview

• Introduction
• RegEx Parsing
• How it Works
• Demo
• Advantages
• Questions

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RegEx Parsing

• What is RegEx ?
• Regular Expressions, most often known as
  RegEx is one of the most popular and widely
  accepted technology used for parsing the specific
  data contents from large text.
• A regular expression is a specific pattern or a
  specific sequence of some special characters
  (known as meta characters) that gives you an
  ability to concisely and flexibly match or
  capture (specify and recognize) strings of
  text, such as sequence of particular characters,
  words, or patterns of characters.
• What is RegEx Parsing ?
• The technique of extracting only the required
  data and neglecting all the other unnecessery
  content from the given large text with the help
  of Regular Expressions is nothing but "RegEx
  Parsing".

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RegEx Parsing

• Tools used for Parsing ?
• There are many tools that are used for RegEx
  parsing. Some of them are
• 1) RegexBuddy
• 2) RegexPal
• 3) RegexMagic
• 5) RegexPlanet
• 6) Rubular

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RegEx Parsing

• How it Works ?
• The main thing about regular expressions that
  makes it so simple and useful for all is its
  syntax. The regular expression syntax is
  declarative The pattern "looks like" what you
  want to match. Another most important thing that
  makes regular expression to spread their magic
  very quickly is its vast and powerful set of
  meta characters. Regular expressions are blessed
  with very rich and powerful set of meta
  characters. Each of these meta characters has its
  unique meaning in itself and plays an important
  role independently or dependently in making the
  regular expression more powerful.

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Metacharacters of Regular Expression

• \d - Matches a digit character.
• \s - Matches any whitespace character
  including space, tab, form-feed, etc.
• \w - Matches any word character including
  underscore.
• \n - Matches a newline character.
• - Matches the preceding subexpression zero
  or more times.
• - Matches the preceding subexpression one
  or more times.
• ? - Matches the preceding subexpression zero
  or one time.
• a-z - A range of characters. Matches any
  character in the specified range.

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Demo
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Advantages

• It is a compact way of describing sets of strings
  which conform to a pattern.
• The regular expression syntax is declarative The
  pattern "looks like" what you want to match.
• Easily compatible with different programing
  languages.
• Easier for non-programmers than code.
• Less error prone than code.
• Use in Compiler Construction.

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Questions ?
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