Regexp
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This document provides an overview of regular expressions (regex). It begins by stating that regex can help find patterns in text and briefly outlines the history of regex from mathematics to its introduction in Unix. It then explains that regex can be used as an alternative to shell wildcards and that many Unix tools incorporate regex. The document proceeds to list programming languages that use regex and provides some basic regex rules including matching single characters, character classes, quantifiers, and assertions. It provides examples to demonstrate matching patterns using these rules.
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![Regular Expressions
Alternatives
Shell Wildcards
Dedicated perl/c/java program
*.txt
x*x[0-9]](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-5-320.jpg)
![Character Class Syntax
A class is denoted by [...]
Can use any character sequence inside the squares
[012], [abc], [aAbBcZ]
Can use ranges inside the squares
[0-9], [a-z], [a-zA-Z], [0-9ab]
Can use not
[^abc], [^0-9]](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-14-320.jpg)
![Examples
Command Meaning
[0-9][0-9]
Match only input lines that
include at least two digits
[Uu][Nn][Ii][Xx]
Match only input lines that
include the word ‘unix’ in
any casing](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-15-320.jpg)
![Which of these match ?
hello [ux][012]
hello world
hello unix
hello u2
hello x10
HELLO U2](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-16-320.jpg)
![Which of these match ?
hello [ux][012]
hello world
hello unix
hello u2
hello x10
HELLO U2](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-17-320.jpg)
![Predefined Character
Classes
d - [0-9]
D - [^0-9]
w - [a-zA-Z_0-9]
W - [^a-zA-Z_0-9]
s - white spaces
S - not white spaces
cheat sheet at: http://www.petefreitag.com/cheatsheets/regex/character-classes/](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-18-320.jpg)
![Which of these match ?
(http://)?w{3}.[a-z]+.com
www.google.com
www.ynet.co.il
http://mail.google.com
http://www.home.com
http://www.tel-aviv.com](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-25-320.jpg)
![Which of these match ?
(http://)?w{3}.[a-z]+.com
www.google.com
www.ynet.co.il
http://mail.google.com
http://www.home.com
http://www.tel-aviv.com](https://image.slidesharecdn.com/regexp-150815165549-lva1-app6892/85/Regexp-26-320.jpg)
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Regular expressions
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1. Define a dictionary that maps DNA nucleotides to their complement (A->T, C->G, etc.)
2. Use the maketrans() string method to generate a translation table
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Regexp
- 1. Regular Expressions Write less, Say more
- 3. Find a pattern in the text
- 4. The Regexp Story Started in Mathematics 1968 Entered the Unix world through Ken Thompson’s qed 1984 Standardized by Henry Spencer’s implementation
- 5. Regular Expressions Alternatives Shell Wildcards Dedicated perl/c/java program *.txt x*x[0-9]
- 6. Regular Expressions & Unix Many UNIX tools take regular expressions grep/egrep filters its input based on regular expressions more/less/most search uses regular expressions vi/vim search and replace use regular expressions
- 7. Regular Expressions Today Used by all programming languages, including: Php, Tcl Python, Perl, Ruby JavaScript, ActionScript, C#, Java C, Objective C, C++ And More
- 9. Rule #1 A Simple character matches itself
- 10. Examples Expression Meaning foo Display only input lines that include the word ‘foo’ python Display only input lines that include the word ‘python’
- 11. Rule #2 A character class matches a single character from the class
- 13. Character Classes 1 2 3 4 5 6 7 8 9 a b c d a b c d b6a - matches the pattern
- 14. Character Class Syntax A class is denoted by [...] Can use any character sequence inside the squares [012], [abc], [aAbBcZ] Can use ranges inside the squares [0-9], [a-z], [a-zA-Z], [0-9ab] Can use not [^abc], [^0-9]
- 15. Examples Command Meaning [0-9][0-9] Match only input lines that include at least two digits [Uu][Nn][Ii][Xx] Match only input lines that include the word ‘unix’ in any casing
- 16. Which of these match ? hello [ux][012] hello world hello unix hello u2 hello x10 HELLO U2
- 17. Which of these match ? hello [ux][012] hello world hello unix hello u2 hello x10 HELLO U2
- 18. Predefined Character Classes d - [0-9] D - [^0-9] w - [a-zA-Z_0-9] W - [^a-zA-Z_0-9] s - white spaces S - not white spaces cheat sheet at: http://www.petefreitag.com/cheatsheets/regex/character-classes/
- 19. Rule #3 A quantifier denotes how many times a letter will match
- 20. Quantifiers 0-9 0-9 0-9 0-9 0-9 0-9 0-9 - 0-9 0-9
- 22. Quantifiers Syntax * means match zero or more times - {0,} + means match one or more times - {1,} ? means match zero or one time - {0,1} {n,m} means match at least n but no more than m times {n} means match exactly n times
- 23. Which of these match ? d{2}-?d{7} 08-9112232 421121212 054-2201121 Phone: 03-9112121 Bond 007
- 24. Which of these match ? d{2}-?d{7} 08-9112232 421121212 054-2201121 Phone: 03-9112121 Bond 007
- 25. Which of these match ? (http://)?w{3}.[a-z]+.com www.google.com www.ynet.co.il http://mail.google.com http://www.home.com http://www.tel-aviv.com
- 26. Which of these match ? (http://)?w{3}.[a-z]+.com www.google.com www.ynet.co.il http://mail.google.com http://www.home.com http://www.tel-aviv.com
- 27. Rule #4 An assertion will match on a condition, not capturing input characters
- 28. Assertions ^ matches the beginning of a line $ matches the end of a line
- 29. Which of these match ? ^d drwxr-xr-x dive -rwxr-xr-x dive lrwxr-xr-x dive drwxr-xr-x /home -rwxr-xr-x /etc/passwd
- 30. Which of these match ? ^d drwxr-xr-x dive -rwxr-xr-x dive lrwxr-xr-x dive drwxr-xr-x /home -rwxr-xr-x /etc/passwd