diff options
Diffstat (limited to 'doc/lispref/control.texi')
| -rw-r--r-- | doc/lispref/control.texi | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/doc/lispref/control.texi b/doc/lispref/control.texi index e308d68b75d..de6cd9301ff 100644 --- a/doc/lispref/control.texi +++ b/doc/lispref/control.texi @@ -618,6 +618,31 @@ To present a consistent environment (@pxref{Intro Eval}) to @var{body-forms} (thus avoiding an evaluation error on match), if any of the sub-patterns let-binds a set of symbols, they @emph{must} all bind the same set of symbols. + +@ifnottex +@anchor{rx in pcase} +@item (rx @var{rx-expr}@dots{}) +Matches strings against the regexp @var{rx-expr}@dots{}, using the +@code{rx} regexp notation (@pxref{Rx Notation}), as if by +@code{string-match}. + +In addition to the usual @code{rx} syntax, @var{rx-expr}@dots{} can +contain the following constructs: + +@table @code +@item (let @var{ref} @var{rx-expr}@dots{}) +Bind the symbol @var{ref} to a submatch that matches +@var{rx-expr}@enddots{}. @var{ref} is bound in @var{body-forms} to +the string of the submatch or nil, but can also be used in +@code{backref}. + +@item (backref @var{ref}) +Like the standard @code{backref} construct, but @var{ref} can here +also be a name introduced by a previous @code{(let @var{ref} @dots{})} +construct. +@end table +@end ifnottex + @end table @anchor{pcase-example-0} |