Basic notation, literal, and sample cases for regex, compiled from multiple sources. Nowadays, regex is one of a must to have skill to analyze complex data structure.

1. Regex in +60’
By: Ghulam Imaduddin
ghulam@ideweb.co.id

2. Before We Start
• Tools:
 Notepad++ (Windows) - https://notepad-plus-plus.org/
 Sublime (Mac) - https://www.sublimetext.com/
 Online tools - https://regex101.com/
• Sample dataset

3. Common Type
• Character class: [abc]
• Character: . s w d
• Quantifiers: ? + * {1}
• Anchors: ^ $
• Group/Capture: (…) (a|b)

4. Character class
• [abc]: single character of: a, b, or c
• [^abc]: character except: a, b, or c
• [a-z]: character in the range of a-z
• [a-zA-Z0-9]: character in the range of a-z or A-Z or 0-9

5. Character
• . : any single character
• s: any whitespace (space, tab); S: any non-whitespace
• d: any digit (equal to [0-9])
• w: any word (equal to [a-zA-Z0-9]
• t: tab character
• r: carriage return
• n: new line

6. Quantifiers
• a?: Zero or one of a
• a*: zero or more of a
• a+: one or more of a
• a{3}: exactly 3 of a
• a{3,}: 3 or more of a
• a{3,6}: between 3 and 6 of a

7. Anchors
• ^: Start of string
• $: end of string
• b: any word boundary
• B: any non-word boundary

8. Group Capture
• (…): capture everything enclosed
• (a|b): match either a or b

9. Hands-on

10. One line to multiline
Input:
Expected Output:
Steps:
1. Change “, ” to “enter”
2. Parse name and email
3. Copy to excel
1
2

11. Cleansing & Reformat
Input:
1. Step 1
• find: ^(d{1,2})-(d{1,2})-(d{4})$
• Replace with: 3-2-1
2. Step 2:
• find: -(d{1})$
• Replace with: -01
3. Step 3: remove non-date line ;)
Output: How:

12. Q & A