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Predicate re_matchsub/4
Availability::- use_module(library(pcre)).(can be autoloaded)
Source[semidet]re_matchsub(+Regex, +String, -Sub:dict)
[semidet]re_matchsub(+Regex, +String, -Sub:dict, +Options)
Match String against Regex. On success, Sub is a dict containing integer keys for the numbered capture group and atom keys for the named capture groups. The entire match string has the key 0. The associated value is determined by the capture_type(Type) option passed to re_compile/3, or by flags if Regex is of the form Pattern/Flags; and may be specified at the level of individual captures using a naming convention for the caption name. See re_compile/3 for details.

The example below exploits the typed groups to parse a date specification: 

?- re_matchsub("(?<date> (?<year_I>(?:\\d\\d)?\\d\\d) -
                (?<month_I>\\d\\d) - (?<day_I>\\d\\d) )"/x,
               "2017-04-20", Sub, []).
Sub = re_match{0:"2017-04-20", date:"2017-04-20",
               day:20, month:4, year:2017}.
Both compilation and execution options are processed. See re_compile/3 and re_match/3 for the set of options. In addition, some compilation options may passed as /Flags to Regex - see re_match/3 for the list of flags.
Regex See re_match/2 for a description of this argument.
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Theodore Cackowski said (2020-01-31T19:29:57):1 upvotes 1 0 downvotes
Picture of user Theodore Cackowski.
Returns error
"re_flag `e' does not exist"
on
"SWI-Prolog version 8.0.1 for x64-win64"
works with "/x" mentioned elsewhere