count-matches ( string regexp -- n )
Regular expressions » Matching operations with regular expressions

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Vocabulary
regexp

Inputs

string	a string
regexp	a regexp

Outputs

n	an integer

Word description
Counts how many disjoint matches the regexp has in the string, as made unambiguous by all-matching-slices.

Definition

USING: kernel math ;

IN: regexp

: count-matches ( string regexp -- n )
    [ 0 ] 2dip [ 3drop 1 + ] each-match ;