Py Regex Practical — Free Python Tutorial
Learn Py Regex Practical in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Py Regex Practical in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
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Py Regex Practical in Python
Regular expressions (regex) are patterns that describe text — they let you search, validate, extract, and replace complex string patterns with a single expressive rule.
Core pattern syntax: . (any char), \d (digit), \w (word char), \s (whitespace), ^ (start), $ (end), * (0+), + (1+), ? (0 or 1), {n,m} (n to m times). Square brackets [abc] match any of a, b, c.
Capturing groups (...) extract matched sub-patterns. Named groups (?P<name>...) make extractions self-documenting. Non-capturing groups (?:...) group without capturing.
Key functions: re.search() finds first match anywhere; re.match() matches at start only; re.findall() returns all matches as a list; re.sub() replaces matches; re.compile() pre-compiles a pattern for reuse.
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