Meta Sequences

Pattern	Description
`.`	Any single character
`\s`	Any whitespace character
`\S`	Any non-whitespace character
`\d`	Any digit, Same as [0-9]
`\D`	Any non-digit, Same as [^0-9]
`\w`	Any word character
`\W`	Any non-word character
`\X`	Any Unicode sequences, linebreaks included
`\C`	Match one data unit
`\R`	Unicode newlines
`\v`	Vertical whitespace character
`\V`	Negation of \v - anything except newlines and vertical tabs
`\h`	Horizontal whitespace character
`\H`	Negation of \h
`\K`	Reset match
`\n`	Match nth subpattern
`\pX`	Unicode property X
`\p{...}`	Unicode property or script category
`\PX`	Negation of \pX
`\P{...}`	Negation of \p
`\Q...\E`	Quote; treat as literals
`\k<name>`	Match subpattern `name`
`\k'name'`	Match subpattern `name`
`\k{name}`	Match subpattern `name`
`\gn`	Match nth subpattern
`\g{n}`	Match nth subpattern
`\g<n>`	Recurse nth capture group
`\g'n'`	Recurses nth capture group.
`\g{-n}`	Match nth relative previous subpattern
`\g<+n>`	Recurse nth relative upcoming subpattern
`\g'+n'`	Match nth relative upcoming subpattern
`\g'letter'`	Recurse named capture group `letter`
`\g{letter}`	Match previously-named capture group `letter`
`\g<letter>`	Recurses named capture group `letter`
`\xYY`	Hex character YY
`\x{YYYY}`	Hex character YYYY
`\ddd`	Octal character ddd
`\cY`	Control character Y
`[\b]`	Backspace character
`\`	Makes any character literal

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