Join David D. Levine for an in-depth discussion in this video Working with character classes and quantifiers, part of AWK Essential Training.
…A set of characters between square brackets…matches any single character in the set.…For example, a bracket xyz bracket c matches an a followed…by a letter x, y, or z, followed by a c.…But the xyz within brackets matches only a single character from the set.…This does not match axyzc.…It has to be either a single x, a single y or a single z.…This set of characters between square brackets is called a character class.…
In this case, the characters in the class are lowercase x, y and z.…You can also specify a range of characters between square brackets.…For example, bracket a dash z bracket, matches…any single lowercase character, 0 dash 9 matches…any digit, uppercase A dash uppercase L matches…any uppercase letter from A through L, inclusive.…Ranges can be combined with other ranges…or individual characters between the square brackets.…For example in this case bracket lowercase a dash z, uppercase A…dash Z, matches any uppercase or lowercase letter between an a or c.…
Finally you can add a caret to the beginning of the character…
Author
David D. Levine
Released
5/21/2014In this course, award-winning author and teacher David D. Levine shows you how to use AWK to read and write data in a variety of formats, produce reports, and automate repetitive tasks. He reviews the nuts and bolts of the language, such as field separators, pattern matching, variables, operators, expressions, and control structures; functions available for manipulating data; and integration with other programs like Excel.
- Determine what AWK is.
- Recognize how to write an AWK program.
- Determine how to use AWK command-line flags.
- Identify how to specify field and record separators with variables.
- Distinguish how to change a CVS file to a tab-separated one.
- Break down how to work with operators and arrays.
- Discover how to format output.
- Interpret how to string data with functions.
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome59s
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1. What Is AWK?
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What is AWK?3m 11s
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2. AWK Command Line Basics
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Writing an AWK program2m 51s
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Using AWK command-line flags6m 18s
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3. Understanding Records and Fields
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4. Understanding Variables and Operators
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5. A Quick Introduction to Regular Expressions
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Regular expression basics5m 19s
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6. Using Control Structures
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Building control structures4m 14s
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Creating an HTML table4m 45s
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7. Formatting the Output
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8. Functions and Arrays
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Manipulating strings7m 28s
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Using associative arrays4m 55s
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9. Combining AWK with Other Tools
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Using pipes7m 6s
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Scripting with AWK4m 56s
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Challenge: Perform a join1m 13s
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Solution: Perform a join2m 55s
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Conclusion
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Goodbye1m 10s
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Video: Working with character classes and quantifiers