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regularni izraz

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Skener – <strong>regularni</strong> <strong>izraz</strong>i<br />

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<br />

Tabelu prelaza u potpunosti definiše odgovarajući opis<br />

gramatike simbola.<br />

Za ovu svrhu se koriste regularne gramatike. Njihova<br />

pravila imaju oblik <strong>regularni</strong>h definicija koje sadrže ime za<br />

određenu vrstu simbola i njen opis u formi regularnog <strong>izraz</strong>a<br />

(regular expression):<br />

ime → <strong>regularni</strong> <strong>izraz</strong><br />

<br />

Oblikovanje <strong>regularni</strong>h <strong>izraz</strong>a<br />

pojedinačni znakovi predstavljaju regularne <strong>izraz</strong>e<br />

regularnom <strong>izraz</strong>u a odgovara string "a"<br />

spajanjem pojedinačnih znakova nastaju novi <strong>regularni</strong><br />

<strong>izraz</strong>i<br />

regularnom <strong>izraz</strong>u abc odgovara string "abc"<br />

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