84 lines
4.9 KiB
Markdown
84 lines
4.9 KiB
Markdown
# Regular Expressions Cheat Sheet
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A regular expression specifies a set of strings that matches it. This cheat sheet is based off Python 3's Regular Expressions (http://docs.python.org/3/library/re.html) but is designed for searches within Sublime Text.
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## Special Characters
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| --- | ----------------------------------------------------------- |
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| `\` | Escapes special characters or signals a special sequence. |
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| `.` | Matches any single character except a newline. |
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| `^` | Matches the start of the string. |
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| `$` | Matches the end of the string |
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| `*` | Greedily matches 0 or more repetitions of the preceding RE. |
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`*?` Matches 0 or more repetitions of the preceding RE.
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+ Greedily matches 1 or more repetitions of the preceding RE.
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+? Matches 1 or more repetitions of the preceding RE.
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? Greedily matches 0 or 1 repetitions of the preceding RE.
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?? Matches 0 or 1 repetitions of the preceding RE.
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A|B Matches A, if A is unmatched then matches B, where A and B are arbitrary REs.
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{m} Matches exactly m many repetitions of the previous RE.
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{m,n} Greedily matches from m many to n many repetitions of the previous RE.
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{m,n}? Matches m many to n many repetitions of the previous RE.
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[...] Indicates a set of characters to match.
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[amk] Matches 'a', 'm', or 'k'.
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[a-z] Matches 'a' through 'z'.
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[a-f0-7] Matches 'a' through 'f' or '0' through '7'.
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[a\-z] Matches 'a', '-', or 'z'.
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[a-] Matches 'a' or '-'.
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[-a] Matches 'a' or '-'.
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[(+*)] Matches '(', '+', '*', or ')'. [] matches special characters literally.
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[\w] Matches the character class for '\w'. See character classes.
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[^5] Matches anything other than '5'. '^' forms the complementary set only as the first character in a set.
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[]()] Matches ']', '(', and ')'. ']' is taken literally only as the first character in a set.
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[()\]] Matches ']', '(', and ')'.
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(...) Matches the RE inside the parenthesis and assigns a new group.
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(?P<name>...) The RE matched is accessible by the group indicated by name.
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(?...) Extension notation which changes a RE's behavior. These do not assign a new group.
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(?aiLmsux) Sets the corresponding flag to each letter. Does not work within Sublime Text.
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(?:...) A non-capturing version of parenthesis. The matched substring cannot be retrieved later.
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(?P=name) Matches the substring matched by the group named name.
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(?#...) A comment, the contents are ignored.
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(?=...) Lookahead assertion, the preceding RE only matches if this matches.
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(?!...) Negative lookahead assestion, the preceding RE only matches if this doesn't match.
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(?<=...) Positive lookbehind assertion, the following RE will only match if preceeded with this fixed length RE.
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(?<!...) Negative lookbehind assertion, the following RE will only match if not preceeded with this fixed length RE.
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(?(id)true|false) If group id exists then uses the true RE, else use the false RE.
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> Character classes
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> \1 Matches the contents of the group labelled by the same number. Acceptable numbers are 1-99.
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> \A Matches at the start of the current string.
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> \b Matches the empty string at the beginning or end of a word. \b matches the boundary between \w and \W.
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> \B Matches the empty string not at the beginning or end of a word.
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> \d Matches any Unicode decimal digit, including 0-9.
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> \D Matches any Unicode non-decimal digit.
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> \s Matches any Unicode whitespace character, including ' ', \t, \n, \r, \f and \v.
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> \S Matches any Unicode non-whitespace character.
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> \w Matches any Unicode word character, including a-z, A-Z, and 0-9.
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> \W Matches any Unicode non-word character.
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> \Z Matches at the end of the string.
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\a Matches the ASCII Bell ().
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\f Matches the ASCII Formfeed ( ).
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\n Matches the ASCII Linefeed.
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\r Matches the ASCII Carriage Return (
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).
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\t Matches the ASCII Horizontal Tab.
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\v Matches the ASCII Vertical Tab ( ).
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