Exercise - Regular Expressions
🔹 Beginner – Literal Matches
Exercise 1
-
Task: Match all occurrences of the word
cat. -
Sample text:
The cat sat on the catalog next to another cat.
Exercise 2
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Task: Match the email domain
example.com. -
Sample text:
Contact me at john@example.com or jane@sample.org.
🔹 Intermediate – Metacharacters & Character Classes
Exercise 3
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Task: Match any digit.
-
Sample text:
Order numbers: 123, 456, A789.
Exercise 4
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Task: Match any word ending with
.jpgor.png. -
Sample text:
photo.jpg, logo.png, notes.txt
Exercise 5
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Task: Match any word that starts with a capital letter.
-
Sample text:
Alice went to Wonderland with Bob and charlie.
🔹 Quantifiers
Exercise 6
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Task: Match all sequences of 2 to 4 digits.
-
Sample text:
Codes: 12, 345, 6789, 12345.
Exercise 7
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Task: Match repeated laughter like
ha,haha,hahaha, etc. -
Sample text:
He said "ha", then "haha", and finally "hahahaha".
🔹 Groups & Capturing
Exercise 8
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Task: Match names in
"Last, First"format and swap them to"First Last"using search & replace. -
Sample text:
Smith, John Doe, Jane
Exercise 9
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Task: Extract all HTML tags (just the tag name).
-
Sample text:
<div>Hello</div><span>World</span>
🔹 Advanced – Lookaheads
Exercise 10
-
Task: Match any number that is followed by
kg. -
Sample text:
50kg 100g 25kg 300ml
Exercise 11
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Task: Match any word that is not followed by a comma.
-
Sample text:
Apple, Orange Banana, Grape
Exercise 12
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Task: Match passwords that contain at least one digit (validation example).
-
Sample text:
abc123 password hello42