Overview
-
Discover how to quickly pull pieces of data from any text file. Learn the fundamentals of Bash regular expressions for the purpose of matching patterns.
Syllabus
-
Introduction
- Use Bash to pull data in seconds
- What you should know
- What are globs?
- Shell expansion order
- Wildcards
- Character sets
- The effect of locale on searches
- Character classes
- Shell globbing options
- What are extended globs?
- Why you should use extended globs
- Make extended globs persistent
- Getting started with extended globs
- Pattern matching with extended globs
- Using extended globs with commands
- Comparing extended globs with regular expressions
- What is brace expansion?
- Using brace expansion for patterns
- What are regular expressions?
- Why aren't regexes consistent?
- Basic vs. Extended Regular Expressions
- Regex support in command line tools
- Matching characters and words
- Specifying occurrences
- Alternation and grouping
- Back references and subexpressions
- Regexes in if conditionals
- Using BASH_REMATCH
- Challenge: Regex to find credit card numbers
- Solution: Regex to find credit card numbers
- Using regular expressions with grep
- Perl compatible regexes with grep
- Performance optimizing grep searches
- Challenge: Create a regex to find telephone numbers
- Solution: Create a regex to find telephone numbers
- Using sed
- Using extended regexes in sed
- Challenge: Create a regex to find IPv4 addresses
- Solution: Create a regex to find IPv4 addresses
- Using regexes in AWK
- Pattern matching differences in AWK
- Next steps
