Spletno orodje za preverjanje regularnega izraza
1,Implementirajte spletne regularne izraze po meri za ekstrahiranje besedilne vsebine
2,Preverite kateri koli regularni izraz
Kaj točno je regularni izraz?
Pri pisanju programov ali spletnih strani, ki obdelujejo nize, je pogosto treba najti nize, ki izpolnjujejo določena kompleksna pravila. Regularni izrazi so orodja, ki se uporabljajo za opis teh pravil. Z drugimi besedami, regularni izrazi so koda, ki beleži besedilna pravila.
Common metacharacters
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Code
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Description
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.
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Matches any character except newline
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\w
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Match letters or numbers or underscores
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\s
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Matches any whitespace
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\d
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Matching numbers
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\b
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Match the beginning or end of a word
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^
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Match the beginning of a string
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$
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Match end of string
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Common qualifiers
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Code / syntax
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Description
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*
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Repeat zero or more times
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+
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Repeat one or more times
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?
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Repeat zero or one time
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{n}
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Repeat n times
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{n,}
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Repeat n or more times
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{n,m}
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Repeat n to m times
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Common antonyms
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Code / syntax
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Description
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\W
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Matches any characters that are not letters, numbers, underscores, or Chinese characters
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\S
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Matches any character that is not a space character
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\D
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Matches any non-digit character
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\B
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Matches where the word is not beginning or ending
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[^x]
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Matches any character except x
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[^aeiou]
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Matches any character except the letters aeiou
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