lpeg.B
Matches patt n characters behind the current position, consuming no input
Prototype
lpeg.B (patt, n)Description
Returns a pattern that matches only if the input string matches patt starting n positions behind the current position. (The default value for n is 1.) If the current position is less than or equal to n, this pattern fails.
Like the "and predicate", this pattern never consumes any input, independently of success or failure, and it never produces any capture.
The pattern patt cannot contain any open reference to grammar rules (see grammars).
(This is an experimental feature. There is a good chance it will change in future versions.)
Like the "and predicate", this pattern never consumes any input, independently of success or failure, and it never produces any capture.
The pattern patt cannot contain any open reference to grammar rules (see grammars).
(This is an experimental feature. There is a good chance it will change in future versions.)
Lua functions
- lpeg.C - Creates a simple capture
- lpeg.Carg - Creates an argument capture
- lpeg.Cb - Creates a back capture
- lpeg.Cc - Creates a constant capture
- lpeg.Cf - Creates a fold capture
- lpeg.Cg - Creates a group capture
- lpeg.Cmt - Creates a match-time capture
- lpeg.Cp - Creates a position capture
- lpeg.Cs - Creates a substitution capture
- lpeg.Ct - Creates a table capture
- lpeg.locale - Returns a table of patterns matching the current locale
- lpeg.match - Matches a pattern against a string
- lpeg.P - Converts a value into a pattern
- lpeg.print - Outputs debugging information to stdout
- lpeg.R - Returns a pattern that matches a range of characters
- lpeg.S - Returns a pattern that matches a set of characters
- lpeg.setmaxstack - Sets the maximum size for the backtrack stack
- lpeg.type - Tests if a value is a pattern
- lpeg.V - Creates a non-terminal variable for a grammar
- lpeg.version - Returns the LPeg version