Combining Metacharacters
This lesson is called Combining Metacharacters, part of the Data Cleaning with R course. This lesson is called Combining Metacharacters, part of the Data Cleaning with R course.
Transcript
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Your Turn
Write regular expressions to match the following, making sure they work in an interactive regex tester:
cute, cuuute, cuuuuuute, and cuuuuuuuuute
strings with both letters and digits
strings ending in a period
lowercase strings
exactly four digits
strings without the letter s
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Course Content
32 Lessons
1
What are Regular Expressions?
03:48
2
Understanding and Testing Regular Expressions
03:51
3
Literal Characters and Metacharacters
06:16
4
Metacharacters: Quantifiers
01:33
5
Metacharacters: Alternation, Special Sequences, and Escapes
02:53
6
Combining Metacharacters
05:18
7
Regex in R
02:58
8
Regular Expressions and Data Cleaning, Part 1
04:15
9
Regular Expressions and Data Cleaning, Part 2
12:00
1
Common Issues in Data Cleaning
03:17
2
Unusable Variable Names
10:11
3
Whitespace
11:10
4
Letter Case
06:52
5
Missing, Implicit, or Misplaced Grouping Variables
11:19
6
Compound Values
10:09
7
Duplicated Values
08:49
8
Broken Values
09:52
9
Empty Rows and Columns
11:30
10
Parsing Numbers
12:02
11
Putting Everything Together
25:50
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