regex - alphanumeric regular expression in R -


i trying use [:alnum:] explained on ?regex

anyone knows why 

grepl("^([a-za-z0-9])+([;])", x="dj5sads;adsa")

returns true, 

grepl("^([:alnum:])+([;])", x="dj5sads;adsa")

returns false?

[:alnum:] name of class. want put named class character class, have enclose pair of []:

[[:alnum:]]

in example it'd be

grepl("^([[:alnum:]])+([;])", x="dj5sads;adsa")     //output: true

demo @ ideone


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