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| English | >> česky << | Deutsch | Español | enternetusers > Tutorials > Regular Expressions Tutorial |
| Úvod / Hledej / enternetusers |
| Regulární výrazy |
| Příklad 1 | Regulární výrazy jsou citlivá na velká a malá písmena. TudížPřípad 1 najde zadaný text, zatímco Případ 2 ne. |
|---|---|
| Příklad 2 | Každý znak uvnitř prohledáváného vzorce je významný, včetně "whitespace" znaků (mezera, tabelátor, konec řádku). |
| Příklad 3 | Některé znaky mají speciální význam. Znak ^ nalezne začátek řádky (Případ 1), zatímco značka dolaru $ nalezne konec řádku (Případ 2) |
| Příklad 4 | Pokud potřebujeme doslovnou hodnotu speciálního znaku, pak tento znak musíme uvést znaménkem "\" (backslash). Případ 1 nenalezne nic, jelikož oba znaky jsou speciální. Případ 2 nalezne všechny $, Případ 3 nalezne $, ale pouze když je to první znak, a Případ 4 pouze když je to poslení znak. "Backslash" (zpětné lomítko) má speciální význam a pokud ho chceme použít doslovně, musíme ho také uvést zpětným lomítkem (Případ 5). |
| Příklad 5 | Tečka. nalezne jakýkoli znak. |
| Příklad 6 | Pokud potřebujeme vyhledávat znak tečku, tak musíme tečku v regulárním výrazu uvést zpětným lomítkem. |
| Příklad 7 | Uvnitř hranatých závorek "[]" můžeme zadat výčet znaků. Výraz odpovídá, pokud je nalezen jakýkoli z těchto znaků. Na pořadí znaků nezáleží (Případ 3) |
| Příklad 8 | Rozsah znaků může být specifikován pomocí syntaxu [ - ]. Případ 1 a Případ 2 jsou ekvivalentní. V jednom výrazu můžeme zadat několik rozsahů (Případ 5). |
| Příklad 9 | Pokud třída znaků začíná znakem ^, potom dané znaky nebudou vybírány. |
| Příklad 10 | Různé alternativy mohou být uzavřeny do závorek a odděleny separátorem |. |
| Příklad 11 | Kvantifikátory říkají, kolikrát se má daný znak vyskytnout. Hvězdička * (Případ 1) odpovídá žádnému nebo více výskytům, plus + (Případ 2) jednomu a více výskytům a otazník ? (Případ 3) žádnému nebo jednomu. |
| Příklad 12 | Několik příkladů použití kvantifikátoru "*" |
| Příklad 13 | Několik příkladů použití kvantifikátoru "+" |
| Příklad 14 | Několik příkladů použití kvantifikátoru "?" |
| Příklad 15 | Složené závorky umožňují přesné zadat, kolikrát se má znak opakovat. {m} nalezne znak vyskytující se přesně m-krát (Případ 1), {m,n} nalezne znak vyskytující se minimálně m-krát a maximálně n-krát (Případ 2) a {m,} nalezna znak vyskytující se minimálně m-krát (Případ 3). |
| Příklad 16 | Kvantifikátory "*", "+", a "?" jsou speciální případy zápisu pomocí závorek. "*" je ekvivalent k {0,} (Případ 1, Případ 2), "+" k {1,} (Případ 3, Případ 4), a "?" k {0,1} (Případ 5, Případ 6). |
| Příklad 17 | Implicitně jsou všechny "subpatterns" nalezeny tolikrát, kolikrát to jen jde. Toto chování může být změněno na nalezení co nejmenšího počtu, pokud je kvantifikátor následován otazníkem. Srovnej "*" (Případ 1) s "*?" (Případ 2), "+" (Případ 3) s "+?" (Případ 4), a "?" (Případ 5) s "??" (Případ 6). |
| Příklad 18 | \w nalezne jakýkoli znak slova (tj. alfanumerické znaky plus "_"). V některých jazycích nejsou tyto zkratky rozeznávány. Pak použijte místo toho třídu znaků ("[A-z0-9_]") (Případ 5). |
| Příklad 19 | \W nalezne jakýkoli znak nevyskytující se ve slovech (vše kromě alfanumerických znaků a "_" ). Srovnej Případ 1 a Případ 2. Je to ekvivalentní k "[^A-z0-9_]". |
| Příklad 20 | \s nalezne "white space" znaky: mezery, konce řádků a tabelátory. \S najde všechny "non-whitespace" znaky. |
| Příklad 21 | \d nalezne jakékoli číslo a \D zbytek. Srovnej Případ 1 a Případ 2. Použij "[0-9]", pokud tvůj programovací jazyk nepodporuje tuto zkratku (Případ 3). |
| Příklad 22 | \b nalezne okraj slova Okraj slova (\b) je definovଠjako bod mezi dv?ma znaky, p?i?em na jedn石tran? je \w a na druh矜W (na po?ad럮ez맮 |
| Příklad 23 | \B nalezne všechno, co není okraj slova. Okraj slova (\b) je definován jako bod mezi dvěma znaky, přičemž na jedné straně je \w a na druhé \W (na pořadí nezáleží). |
| Příklad 24 | \A nalezne začátek řetězce. Je podobný ^, ale ^ nachází začátek pouze po na začátku řádku (po "newline"), pokud je zpracováván víceřádkový řetězec. Podobně \Z nalezne konec řetězce nebo konec řádku. Je podobný $, ale $ nalezne pouze konce řádku (před "newline"). |
| Příklad 25 | (?=<pattern>) se podívá dopředu, zda daný vzorek existuje, ale nezahrne ho do zásahu. |
| Příklad 26 | (?!<pattern>) se podívá dopředu, zda daný vzorek existuje. Pokud ano, pak nebude žádný zásah. |
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