update

_subsections/lesson-04.org

@@ -10,8 +10,7 @@
 - [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
 - [[https://missing.csail.mit.edu/2020/data-wrangling/][class notes]]
 
-- Curr: https://youtu.be/sz_dsktIjt4?si=0WESCuewbWY5mJiv&t=622
-
+- Curr: https://youtu.be/sz_dsktIjt4?si=oVhYD6bPPM6FzWSL&t=1325
 
 *** timestamps
 :PROPERTIES:
@@ -24,12 +23,12 @@
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=456s][07:36 - Replacement Expressions]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=538s][08:58 - Regular Expression]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=560s][09:20 - Regular Expressions]]
-+ [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=620s][10:20 - Square Brackets]] *current*
++ [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=620s][10:20 - Square Brackets]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=693s][11:33 - Add Modifiers]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=776s][12:56 - Alternations]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1029s][17:09 - Anchoring the Regular Expression]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1138s][18:58 - Capture Groups]]
-+ [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1215s][20:15 - Regular Expression Debugger]]
++ [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1215s][20:15 - Regular Expression Debugger]] *current*
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1450s][24:10 - Regular Sessions]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1561s][26:01 - Match and Email Address ]]
 + [[https://www.youtube.com/watch?v=sz_dsktIjt4&t=1743s][29:03 - Sort]]
@@ -69,3 +68,11 @@ sed 's/.*blahblah blah//'
 
 - uses regular expressions
   - way of matching text
+
+*** sed modifiers
+- (ab)* - remove zero or more of 'ab'
+- -E use new replacement
+- (ab|bc)* - remove 'ab' or 'bc'
+
+** regex debugger
+- regex101.com