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Category
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Pattern
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Replacement
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Example (Before)
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Example (After)
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Basic Syntax
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re.sub(pattern, replacement, string)
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Replaces all occurrences
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'Phone: 123-456-7890'
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'Phone: ###-###-####'
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Basic Syntax
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re.sub(pattern, replacement, string, count=n)
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Replaces first n occurrences
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'banana banana banana'
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'banana banana'
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Basic Syntax
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re.sub(pattern, replacement, string, flags=re.IGNORECASE)
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Case-insensitive replacement
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'HELLO world'
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'hello world'
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Common Substitution Patterns
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\d
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#
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'Order 12345'
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'Order #####'
|
|
Common Substitution Patterns
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\s+
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' ' (space)
|
'Hello World'
|
'Hello World'
|
|
Common Substitution Patterns
|
[aeiou]
|
*
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'Replace vowels'
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'R*pl*c* v*w*ls'
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|
Common Substitution Patterns
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\bfoo\b
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bar
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'foo is here'
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'bar is here'
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Common Substitution Patterns
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(\d{3})-(\d{2})-(\d{4})
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XXX-XX-\3
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'123-45-6789'
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'XXX-XX-6789'
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Common Substitution Patterns
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https?://\S+
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URL_REMOVED
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'Visit http://example.com'
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'Visit URL_REMOVED'
|
|
Using Capture Groups
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(\w+)@(\w+)\.(\w+)
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\1[at]\2[dot]\3
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'john@example.com'
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'john[at]example[dot]com'
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Using Capture Groups
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(\d{2})/(\d{2})/(\d{4})
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\3-\1-\2
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'12/31/2024'
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'2024-12-31'
|
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Using Capture Groups
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(\w)\1+
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\1
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'baaaad'
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'bad'
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Using Capture Groups
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(\w+) (\w+)
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\2 \1
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'Hello World'
|
'World Hello'
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Using Capture Groups
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(?<=\bMr\.|Mrs\.|Dr\.)\s(\w+)
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***
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'Dr. John'
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'Dr. ***'
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Advanced Substitutions
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(?<=\d{3})\d{3}(?=\d{4})
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XXX
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'1234567890'
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'123XXX7890'
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Advanced Substitutions
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(?<=\b\d{4})\d+
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XXXX
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'1234567812345678'
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'1234XXXXXXXXXXXX'
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Advanced Substitutions
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(\w{4})
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Function based replacement
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'word'
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'****'
|
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Substituting with Function
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Function example: Email Censorship
|
Custom function-based replacement
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'Contact me at john@example.com'
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'Contact me at john[hidden]'
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