Flashcards

Regex basics

Mircea Chira computer science general Inglês 34 flashcards

Flashcards do conjunto (34)

1^Start of string or line
2$End of string or line
3\AStart of input (ignores 'm' flag)
4\ZEnd of input (ignores 'm' flag)
5\GEnd of the previous match
6\bWord boundary (any position proceeded or followed - but not both - by a letter, digit or underscore)
7\BNon-word boundary
8\nNew line
9\rCarriage return
10\tTab
11\vVertical tab
12\fForm feed
13*Zero or more
14+One or more
15?Zero or One (i.e. optional)
16{n}Exactly 'n' (any number)
17{n,}Minimum ('n' or more)
18{n,m}Range ('n' or more, but less or equal to 'm')
19\wWord
[a-zA-Z0-9_]
20\WNon-word
[^a-zA-Z0-9_]
21\dDigit
[0-9]
22\DNon-digit
23\sWhitespace (Form-feed, tab, vertical-tab, new line, carriage return and space)
[\f\t\x0b\n\r ]
24\SNon-whitespace
25\xHexadecimal digit
\x00=null; \x0d=\r; [\x61-\x7a]=[a-z]
26\OOctal digit
27.Any character (except new line \n)
28(...)Capture group - captures a set of characters for a later expression
29(?:...)Non-capture group - groups an expression but does not capture. e.g. /((?:foo|fu)bar)/ matches "foobar" or "fubar" without "foo" or "fu" appearing as a captured subpattern
30(?=...)Lookahead - match on the characters following. e.g. /ab(?=c)/ match "ab" only when followed by "c"
31(?!...)Negative lookahead - match on characters that aren't following. e.g. /ab(?!c)/ match "ab" only when NOT followed by "c"
32(?<=...)Positive look-behind assertion. e.g. /(?<=foo)bar/ matches "bar" when preceded by "foo"
33(?<!...)Negative look-behind assertion. e.g. /(?
34(?#...)Comment e.g. (?# This comment is ignored entirely)

Descrição: computer science general FlashCards sobre Regex basics, criado por Mircea Chira em 03-10-2017.
Criado por: Mircea Chira · out 2017
Atualizado: 3 out 2017
Visualizações: 1
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