re<\/code> module:<\/p>\n\n\n\n![\"Python](\"https:\/\/www.pythontutorial.net\/wp-content\/uploads\/2021\/11\/python-regular-expressions.svg\")
<\/figure>\n<\/div>\n\n\nThe re<\/code> module has many helpful classes and functions that help you to manage regular expressions effectively.<\/p>\n\n\n\n\nSection 1. Basic Regular Expressions #<\/a><\/h2>\n\n\n\nThis section introduces the regular expression basics including functions, character sets, anchors, and word boundaries.<\/p>\n\n\n\n
\n- Regular expressions<\/a>\u00a0\u2013 learn how regular expressions work in Python and how to use functions in the
re<\/code> module to match a string for a pattern.<\/li>\n\n\n\n- Character sets<\/a> \u2013 introduce to you the character sets (
\\d<\/code>,\u00a0\\w<\/code>,\u00a0\\s<\/code>) that match digits, word characters, and spaces.<\/li>\n\n\n\n- Anchors<\/a> \u2013 show you how to use the caret (
^<\/code>) and dollar ($<\/code>) anchors to match at the beginning and end of a string.<\/li>\n\n\n\n- Word Boundary<\/a> \u2013 guide you on how to use word boundary (
\\b<\/code>) to match the whole word.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n\nSection 2. Quantifiers #<\/a><\/h2>\n\n\n\nThis section shows you how to apply quantifiers to specific parts and two modes of quantifiers including greedy and lazy.<\/p>\n\n\n\n
\n- Quantifiers<\/a> \u2013 learn how to use the quantifiers to match a number of instances of a character or character class.<\/li>\n\n\n\n
- Greedy Quantifiers<\/a> \u2013 learn how the greedy quantifiers work.<\/li>\n\n\n\n
- Non-greedy (or lazy) Quantifiers<\/a>\u00a0\u2013 explain how non-greedy quantifiers works and show you how to turn greedy quantifiers into non-greedy quantifiers.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n\n
Section 3. Sets and Ranges #<\/a><\/h2>\n\n\n\nThis section covers the sets and ranges to match the characters.<\/p>\n\n\n\n
\n- Sets & Ranges<\/a> \u2013 learn how to use the sets and ranges to match a character in a set or range of characters.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n\n
Section 4. Grouping #<\/a><\/h2>\n\n\n\nThis section shows you how to use the grouping to extract portions of information, reference the preceding group, and apply alternation.<\/p>\n\n\n\n
\n- Capturing groups<\/a> \u2013 include a part of a match in the matches array and assign it a name using a named group.<\/li>\n\n\n\n
- Backreferences<\/a> \u2013 learn about backreferences and how to apply them effectively.<\/li>\n\n\n\n
- Alternation<\/a> \u2013 show you how to use the \u201cOR\u201d operator in regular expressions.<\/li>\n\n\n\n
- Non-capturing groups<\/a> – create a group but don’t save it in the groups of the match.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n\n
Section 5. Look Around #<\/a><\/h2>\n\n\n\nThis section explains the concepts of different types of look-around mechanisms.<\/p>\n\n\n\n
\n- Lookahead<\/a> \u2013 introduce to you the lookahead concept and how to use it to match X only if it is followed by Y.<\/li>\n\n\n\n
- Lookbehind<\/a>\u00a0\u2013 explain the lookbehind concept and how to match X only if there is Y before it.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n\n
Section 6. Python regex functions #<\/a><\/h2>\n\n\n\nThis section discusses the regular expression functions in the re<\/code> module in detail and the regex flags.<\/p>\n\n\n\n\n- findall()<\/a> \u2013 find all matches that match a regular expression in a string.<\/li>\n\n\n\n
- fullmatch()<\/a> – match the whole string with a pattern.<\/li>\n\n\n\n
- finditer()<\/a> – return an iterator yielding Match objects over all non-overlapping matches for a regular expression in a string.<\/li>\n\n\n\n
- match()<\/a> – check if zero or more characters at the beginning of a string match a regular expression.<\/li>\n\n\n\n
- search()<\/a> \u2013 search for the first match in a string.<\/li>\n\n\n\n
- sub()<\/a> – return a string with matches replaced with a replacement.<\/li>\n\n\n\n
- split()<\/a> – split a string by the matches of a regular expression.<\/li>\n\n\n\n
- Regex flags<\/a> – learn about the regex flags and how they change the way the regex engine matches patterns.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n\n
Section 7. Python Regex Cheat Sheet #<\/a><\/h2>\n\n\n\n