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.\" Derived from section 6.4.1 in manual.html of Lua 5.3.1:
.\" $Id: patterns.7,v 1.7 2022/02/18 10:24:33 jsg Exp $
.\"
.Dd $Mdocdate: February 18 2022 $
.Dt PATTERNS 7
.Os
.Sh NAME
.Nm patterns
.Nd Lua's pattern matching rules
.Sh DESCRIPTION
Pattern matching in
.Xr httpd 8
is based on the implementation of the Lua scripting language and
provides a simple and fast alternative to the regular expressions (REs) that
are described in
.Xr re_format 7 .
Patterns are described by regular strings, which are interpreted as
patterns by the pattern-matching
.Dq find
and
.Dq match
functions.
This document describes the syntax and the meaning (that is, what they
match) of these strings.
.Sh CHARACTER CLASS
A character class is used to represent a set of characters.
The following combinations are allowed in describing a character
class:
.Bl -tag -width Ds
.It Ar x
(where
.Ar x
is not one of the magic characters
.Sq ^$()%.[]*+-? )
represents the character
.Ar x
itself.
.It .
(a dot) represents all characters.
.It %a
represents all letters.
.It %c
represents all control characters.
.It %d
represents all digits.
.It %g
represents all printable characters except space.
.It %l
represents all lowercase letters.
.It %p
represents all punctuation characters.
.It %s
represents all space characters.
.It %u
represents all uppercase letters.
.It %w
represents all alphanumeric characters.
.It %x
represents all hexadecimal digits.
.It Pf % Ar x
(where
.Ar x
is any non-alphanumeric character) represents the character
.Ar x .
This is the standard way to escape the magic characters.
Any non-alphanumeric character (including all punctuation characters,
even the non-magical) can be preceded by a
.Sq %
when used to represent itself in a pattern.
.It Bq Ar set
represents the class which is the union of all
characters in
.Ar set .
A range of characters can be specified by separating the end
characters of the range, in ascending order, with a
.Sq - .
All classes
.Sq Ar %x
described above can also be used as components in
.Ar set .
All other characters in
.Ar set
represent themselves.
For example,
.Sq [%w_]
(or
.Sq [_%w] )
represents all alphanumeric characters plus the underscore,
.Sq [0-7]
represents the octal digits,
and
.Sq [0-7%l%-]
represents the octal digits plus the lowercase letters plus the
.Sq -
character.
.Pp
The interaction between ranges and classes is not defined.
Therefore, patterns like
.Sq [%a-z]
or
.Sq [a-%%]
have no meaning.
.It Bq Ar ^set
represents the complement of
.Ar set ,
where
.Ar set
is interpreted as above.
.El
.Pp
For all classes represented by single letters (
.Sq %a ,
.Sq %c ,
etc.),
the corresponding uppercase letter represents the complement of the class.
For instance,
.Sq %S
represents all non-space characters.
.Pp
The definitions of letter, space, and other character groups depend on
the current locale.
In particular, the class
.Sq [a-z]
may not be equivalent to
.Sq %l .
.Sh PATTERN ITEM
A  pattern item can be
.Bl -bullet
.It
a single character class, which matches any single character in the class;
.It
a single character class followed by
.Sq * ,
which matches zero or more repetitions of characters in the class.
These repetition items will always match the longest possible sequence;
.It
a single character class followed by
.Sq + ,
which matches one or more repetitions of characters in the class.
These repetition items will always match the longest possible sequence;
.It
a single character class followed by
.Sq - ,
which also matches zero or more repetitions of characters in the class.
Unlike
.Sq * ,
these repetition items will always match the shortest possible sequence;
.It
a single character class followed by
.Sq \&? ,
which matches zero or one occurrence of a character in the class.
It always matches one occurrence if possible;
.It
.Sq Pf % Ar n ,
for
.Ar n
between 1 and 9;
such item matches a substring equal to the n-th captured string (see below);
.It
.Sq Pf %b Ar xy ,
where
.Ar x
and
.Ar y
are two distinct characters;
such item matches strings that start with
.Ar x ,
end with
.Ar y ,
and where the
.Ar x
and
.Ar y
are
.Em balanced .
This means that if one reads the string from left to right, counting
.Em +1
for an
.Ar x
and
.Em -1
for a
.Ar y ,
the ending
.Ar y
is the first
.Ar y
where the count reaches 0.
For instance, the item
.Sq %b()
matches expressions with balanced parentheses.
.It
.Sq Pf %f Bq Ar set ,
a
.Em frontier pattern ;
such item matches an empty string at any position such that the next
character belongs to
.Ar set
and the previous character does not belong to
.Ar set .
The set
.Ar set
is interpreted as previously described.
The beginning and the end of the subject are handled as if
they were the character
.Sq \e0 .
.El
.Sh PATTERN
A pattern is a sequence of pattern items.
A caret
.Sq ^
at the beginning of a pattern anchors the match at the beginning of
the subject string.
A
.Sq $
at the end of a pattern anchors the match at the end of the subject string.
At other positions,
.Sq ^
and
.Sq $
have no special meaning and represent themselves.
.Sh CAPTURES
A pattern can contain sub-patterns enclosed in parentheses; they
describe captures.
When a match succeeds, the substrings of the subject string that match
captures are stored (captured) for future use.
Captures are numbered according to their left parentheses.
For instance, in the pattern
.Qq (a*(.)%w(%s*)) ,
the part of the string matching
.Qq a*(.)%w(%s*)
is stored as the first capture (and therefore has number 1);
the character matching
.Qq \&.
is captured with number 2,
and the part matching
.Qq %s*
has number 3.
.Pp
As a special case, the empty capture
.Sq ()
captures the current string position (a number).
For instance, if we apply the pattern
.Qq ()aa()
on the string
.Qq flaaap ,
there will be two captures: 2 and 4.
.Sh SEE ALSO
.Xr fnmatch 3 ,
.Xr re_format 7 ,
.Xr httpd 8
.Rs
.%A Roberto Ierusalimschy
.%A Luiz Henrique de Figueiredo
.%A Waldemar Celes
.%Q Lua.org
.%Q PUC-Rio
.%D June 2015
.%R Lua 5.3 Reference Manual
.%T Patterns
.%U https://www.lua.org/manual/5.3/manual.html#6.4.1
.Re
.Sh HISTORY
The first implementation of the pattern rules were introduced with Lua 2.5.
Almost twenty years later,
an implementation based on Lua 5.3.1 appeared in
.Ox 5.8 .
.Sh AUTHORS
The pattern matching is derived from the original implementation of
the Lua scripting language written by
.An -nosplit
.An Roberto Ierusalimschy ,
.An Waldemar Celes ,
and
.An Luiz Henrique de Figueiredo
at PUC-Rio.
It was turned into a native C API for
.Xr httpd 8
by
.An Reyk Floeter Aq Mt reyk@openbsd.org .
.Sh CAVEATS
A notable difference with the Lua implementation is the position in the string
returned by captures.
It follows the C-style indexing (position starting from 0)
instead of Lua-style indexing (position starting from 1).