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Semalt Nyanzvi Inotsanangura Zvinhu Zvikuru Zvaunofanira Kuziva NezveRegex Scraper

1 answers:

Mutsara kana kuti regex ndeyekuenzaniswa kwemashoko anoshandiswa kutsvaga data the net. Inobvumira vateereri nevatadzi kuti vawane zvinyorwa zvinobatsira. Kubva muna 1980, mazwi anowanzoshandiswa pakunyora magwaro. Vanotora nhaurirano dzemashoko e text textors nezwi processor with data yakaverengwa uye inogadzirika. C ++, Python, JavaScript nedzimwe mimwe mitauro yakaronga inobudisa regex-based libraries uye inoita kuti basa rako rive nyore.

Itai zvikumbiro nemashoko anowanzoitika:

Maitiro akasiyana-siyana akaitwa nemazwi anowanzoitwa kana kuti regex - dedicado server. Ne PowerGREP, tinokwanisa kutsvaga kuburikidza nemafaira uye mafaira pamakombiyuta edu, shandura dheta uye kuunganidza mashoko kubva kune zvakasiyana-siyana. PowerGREP injini nguva dzose injini inowirirana ne Pearl,. Net uye Java zvigadziriswe uye inobatsira kune vateereri, webmasters, uye vateereri vepurogiramu. Kana iwe uchida kuvaka purogiramu yebasa kana kuti foni, unogona kuchengetedza nguva yakawandisa uye simba nemashoko anowanzoitika. Iwe unongoda kuisa mabhuku mashomanana kuti uwane unhu hwakagadzirwa. RegexBuddy uye EditPad Pro mapurogiramu maviri akaenzana akavakwa nemashoko anowanzoitika.

Inokodzera kune vasiri mapurogiramu:

Chimwe chezvakakosha zvekutaura nguva dzose ndezvokuti zvakakodzera kune vasiri-coders uye vasina-programmers. Nekutaura nguva dzose, haufaniri kudzidza dzidzo dzakaoma kana kuti uine mazano epurogiramu akakurumbira. Iwe unongoda kuziva ruzivo rwePython, BeautifulSoup, JavaScript, uye Regex kuti uite basa rako riite. Izvo zvakanakawo kune freelancers uye webmasters vasina kukwidziridza coding kana mazano ekugadzira.

Syntax:

Purogiramu ye regex inofanidza chinangwa chata. Iyi muenzaniso inoumbwa nekuenzanisa kweatomu. Atomu inongova imwechete mu regex pattern iyo inoshandisa tambo nenzira iri nani. Iko kune gumi nemana regex vanhu, zvichibva pane zvavari kureva uye zvinoshandiswa.

XPath - Chishandiso chine simba kwauri:

XPath ndechimwe chezvinhu zvakanakisisa uye zvinobatsira zvinyorwa zvinyorwa s uye zvinyorwa zvekare. Iyo inounganidza mapepa epa data kubva pamapeji ewebhu akasiyana, inoita zvisungo uye inoronga demo mumutauro unooneka uye unogona kupera. XPath inotanga kuzivisa zvinyorwa zvewebsite, inoongorora unhu hwayo uye huwandu hunhu hwehuwandu huri iwe. Iyi injini yekutsvaga uye webhuta yewebhu inopa yakawedzerwa regex zvidzidzo, zvakadai sekudzoka shure, POSIX nhamba uye kushandura.

Imwe mutsara weRegex inogona kutora mitsara zana yemitemo:

Mutsara mumwechete we regex wakakwana kuti udzokere kusvika kumiganhu 100 yemitemo kubva pawebhu peji. Zvinoreva kuti haufaniri kudzidza kudzidza zvakanakisisa purogiramu kuitira kuti basa rako riite. Nekutaura nguva dzose, zviri nyore kwazvo kuongorora data kubva kune mawebsite akasiyana-siyana uye kugadzira mapepa emadhina nemaketani.

Nemhaka yesimba rayo rinoratidza uye kusununguka kwekuverenga, mitauro yakasiyana-siyana yakaronga uye zvishandiso yakasarudza kutaura nguva dzose seJava, Python, JavaScript, Ruby, Qt, XML Schema uye. NET Framework. Perl 5. 10 inoshandisa syntactic extensions iyo inogadzirwa mune zvose Python uye PCRE. Nenzira dzakasiyana-siyana vatongi vanomanikidzwa kuti vashandise regex-based mibvunzo mukati mazvo nokuti kutsvaga injini hazvipi kupa regex tsigiro kuvanhu.

Kutaura nguva dzose ibasa rinokosha pakutsanangura uye kutora webhu zvayo. Vanopa ruzivo rwakakura rwevashandi uye vakakodzera kune vose vadzidzisi uye vasiri vadzidzisi.

December 22, 2017