regular expression

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Ben
15 Feb 2019
1>>> m = re.match(r"(\w+) (\w+)", "Isaac Newton, physicist")
2>>> m[0]       # The entire match
3'Isaac Newton'
4>>> m[1]       # The first parenthesized subgroup.
5'Isaac'
6>>> m[2]       # The second parenthesized subgroup.
7'Newton'
8
source
Klara
05 Feb 2017
1// Javascript Regex Reference
2//  /abc/	A sequence of characters
3//  /[abc]/	Any character from a set of characters
4//  /[^abc]/	Any character not in a set of characters
5//  /[0-9]/	Any character in a range of characters
6//  /x+/	One or more occurrences of the pattern x
7//  /x+?/	One or more occurrences, nongreedy
8//  /x*/	Zero or more occurrences
9//  /x?/	Zero or one occurrence
10//  /x{2,4}/	Two to four occurrences
11//  /(abc)/	A group
12//  /a|b|c/	Any one of several patterns
13//  /\d/	Any digit character
14// /\w/	An alphanumeric character (“word character”)
15//  /\s/	Any whitespace character
16//  /./	Any character except newlines
17//  /\b/	A word boundary
18//  /^/	Start of input
19//  /$/	End of input
source
Zahra
25 Aug 2019
1Regular Expression FUll Cheatsheet (For quick look) :)
2note: for downloading visit https://buggyprogrammer.com/regular-expression-cheatsheet/
3------x-------------------x----------------x------------x----------------x-------------
4
5# -------------- Anchors --------------
6^   →  Start of string, or start of line in multiline pattern
7\A  →  Start of string
8$   →  End of string, or end of line in multi-line pattern
9\Z  →  End of string
10\b  →  Word boundary
11\B  →  Not word boundary
12\<  →  Start of word
13\>  →  End of word
14
15
16# ---------- Character Classes --------
17\c  →  Control character
18\s  →  White space
19\S  →  Not white space
20\d  →  Digit
21\D  →  Not digit
22\w  →  Word
23\W  →  Not word
24\x  →  Hexadecimal digit
25\O  →  Octal digit
26
27
28# --------- Quantifiers -----------------
29*     →    0 or more 
30{3}   →    Exactly 3
31+     →    1 or more 
32{3,}  →    3 or more
33?     →    0 or 1 
34{3,5} →    3, 4 or 5
35Add a ? to a quantifier to make it ungreedy.
36
37
38# ------- Special Characters -------------
39\n   →  New line
40\r   →  Carriage return
41\t   →  Tab
42\v   →  Vertical tab
43\f   →  Form feed
44\xxx →  Octal character xxx
45\xhh →  Hex character hh
46
47
48# --------- Groups and Ranges -------------
49.       →  Any character except new line (\n)
50(a|b)   →  a or b
51(...)   →  Group
52(?:...) →  Passive (non-capturing) group
53[abc]   →  Range (a or b or c)
54[^abc]  →  Not (a or b or c)
55[a-q]   →  Lower case letter from a to q
56[A-Q]   →  Upper case letter from A to Q
57[0-7]   →  Digit from 0 to 7
58\x      →  Group/subpattern number "x"
59Ranges are inclusive.
60
61
62# ----------- Assertions ---------------
63?=         →  Lookahead assertion
64?!         →  Negative lookahead
65?<=        →  Lookbehind assertion
66?!= or ?<! →  Negative lookbehind
67?>         →  Once-only Subexpression
68?()        →  Condition [if then]
69?()|       →  Condition [if then else]
70?#         →  Comment
71
72
73# ------ Pattern Modifiers --------
74g   →  Global match
75i*  →  Case-insensitive
76m*  →  Multiple lines
77s*  →  Treat string as single line
78x*  →  Allow comments and whitespace in pattern
79e*  →  Evaluate replacement
80U*  →  Ungreedy pattern
81*   →  PCRE modifier
82
83
84# ------ String Replacement ------
85$n  →  nth non-passive group
86$2  →  "xyz" in /^(abc(xyz))$/
87$1  →  "xyz" in /^(?:abc)(xyz)$/
88$`  →  Before matched string
89$'  →  After matched string
90$+  →  Last matched string
91$&  →  Entire matched string
92Some regex implementations use \ instead of $
93
94
95# ---------- Escape Sequences ------------
96\ Escape following character
97\Q Begin literal sequence
98\E End literal sequence
99
100"Escaping" is a way of treating characters which have a special meaning in regular
101expressions literally, rather than as special characters.
102
103
104# --------- Common Metacharacters ---------
105^ 
106[
107.
108$
109{
110*
111(
112\
113+
114)
115|
116<
117>
118The escape character is usually \
119
120
121# ------------ POSIX ----------------
122[:upper:]  →  Upper case letters
123[:lower:]  →  Lower case letters
124[:alpha:]  →  All letters
125[:alnum:]  →  Digits and letters
126[:digit:]  →  Digits
127[:xdigit:] →  Hexadecimal digits
128[:punct:]  →  Punctuation
129[:blank:]  →  Space and tab
130[:space:]  →  Blank characters
131[:cntrl:]  →  Control characters
132[:graph:]  →  Printed characters
133[:print:]  →  Printed characters and spaces
134[:word:]   →  Digits, letters and underscore
source
Lia
17 Jan 2017
1/findme/
2Characters \, ., \cX, \d, \D, \f, \n, \r, \s, \S, \t, \v, \w, \W, \0, \xhh, \uhhhh, \uhhhhh, [\b]	
3Assertions 	^, $, x(?=y), x(?!y), (?<=y)x, (?<!y)x, \b, \B
4Groups 		(x), (?:x), (?<Name>x), x|y, [xyz], [^xyz], \Number	
5Quantifiers *, +, ?, x{n}, x{n,}, x{n,m}
6Unicode \p{UnicodeProperty}, \P{UnicodeProperty}
7javascript
8let re = /findme/
9let defaults = new RegExp('compiled'); 
10defaults = { dotAll: false, flags: "", global: false, ignoreCase: false, falselastIndex: 0, multiline: false, source: "abc", sticky: false, unicode: false}
source
Imen
16 Jun 2019
1One of my favorite regex testers:
2https://regex101.com/
Hugo
05 Jan 2020
1Parameters:
2regex - a delimiting regular expression
3
4
5Returns:
6An array of strings computed by splitting the given string.
7
8
9Throws:
10PatternSyntaxException - if the provided regular expression’s 
11                         syntax is invalid.  
12
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