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Matthew Butterick 7 years ago
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@ -700,7 +700,7 @@ A @deftech{pattern} is one of the following:
@item{a @deftech{quantified pattern}: a @tech{pattern} followed by either @litchar{*} (``zero or more''), @litchar{?} (``zero or one''), or @litchar{+} (``one or more''). Quantification can also be denoted by integers within curly brackets. So @litchar|{{2}}| means ``exactly 2''; @litchar|{{2,5}}| means ``between 2 and 5, inclusive''; @litchar|{{2,}}| means ``2 or more''; and @litchar|{{,5}}| means ``up to 5''.} @item{a @deftech{quantified pattern}: a @tech{pattern} followed by either @litchar{*} (``zero or more''), @litchar{?} (``zero or one''), or @litchar{+} (``one or more''). Quantification can also be denoted by integers within curly brackets. So @litchar|{{2}}| means ``exactly 2''; @litchar|{{2,5}}| means ``between 2 and 5, inclusive''; @litchar|{{2,}}| means ``2 or more''; and @litchar|{{,5}}| means ``up to 5''.}
@item{an @deftech{optional pattern}: a @tech{pattern} surrounded by @litchar{[} and @litchar{]}}. (The @litchar{?} zero-or-one quantifier means the same thing.) @item{an @deftech{optional pattern}: a @tech{pattern} surrounded by @litchar{[} and @litchar{]}. (The @litchar{?} zero-or-one quantifier means the same thing.)}
@item{an explicit sequence: a @tech{pattern} surrounded by @litchar{(} and @litchar{)}}] @item{an explicit sequence: a @tech{pattern} surrounded by @litchar{(} and @litchar{)}}]

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