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Regex quick overview

This section is available only in English

Parsing group contains blocks intended to process input data. Input data are processed using blocks, which work with regular expressions. More information about the regular expressions is available on: https://en.wikipedia.org/wiki/Regular_expression

Regular expressions basics:

regular expression description
. Any character except newline
a The character a
ab The string ab
a|b a or b
a* 0 or more a’s
\ Escapes a special character

Regular Expression Quantifiers:

regular expression description
* 0 or more
+ 1 or more
? 0 or 1
{2} Exactly 2
{2, 5} Between 2 and 5
{2,} 2 or more
{,5} Up to 5

Regular Expression Groups:

regular expression description
(...) Capturing group
(?P<Y>...) Capturing group named Y
(?:...) Non-capturing group
\Y Match the Y’th captured group
(?P=Y) Match the named group Y
(?#...) Comment

Regular Expression Character Classes:

regular expression description
[ab-d] One character of: a, b, c, d
[^ab-d] One character except: a, b, c, d
[\b] Backspace character
\d One digit
\D One non-digit
\s One whitespace
\S One non-whitespace
\w One word character
\W One non-word character

Regular Expression Assertions:

regular expression description
^ Start of string
\A Start of string, ignores m flag
$ End of string
\Z End of string, ignores m flag
\b Word boundary
\B Non-word boundary
(?=...) Positive lookahead
(?!...) Negative lookahead
(?<=...) Positive lookbehind
(?<!...) Negative lookbehind
(?()|) Conditional