Module easy_regex::settings
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Settings to be used as necessary meta information for patterns.
Here are the meta data such as flags, boundaries etc. needed to be added to regular expressions.
For most methods except group and named_group,
the Settings struct would be used and for the two mentioned, the GroupSettings struct which
has one extra meta that is is_non_capture.
There is a default implemention for both structs to reduce typing repetitive meta over and over and shorten code length.
Two more methods are provided for setting an exact or a range of repetitions in case of only declaring range or exact options.
Those are exactly and range for base settings and grp_exactly and grp_range for group settings.