Regex quick overview

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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