What is a regular expression
Regular expressions are a text pattern matching tool used to search, replace, and extract specific patterns from strings.
Common metacharacters
. Any character, \ d number, \ w word character, \ s blank character, ^ line beginning, $line ending.
measure word
*Zero or multiple times,+once or multiple times? Zero times or once, {n} exactly n times.
Practical examples
Match email, extract URL, verify phone number, filter special characters.
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