Description Usage Details Examples
View source: R/vRbalExpressions.R
look for something at the beginning of a line
look for something at the end of a line
what to look for
alias for 'then' for start of an expression
maybe something is there?
any character any number of times
any character any number of times BUT this
Any character at least one time
Any character at least one time except for these characters
Line break
html shorthand
tab
Any alphanumeric
Any given character
Any given character (short)
Range
or
creates an empty vRbalExpression object that can be added to
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vRbalExpressions are added together by calling the various constructors. Alternatively, an empty expression can be created by the call to 'verEx()'.
1 2 3 | testExpr <- startofline() + then("http") + maybe("s") + then("://") + maybe("www.") + anythingBut(" ") + endofline()
testWWW <- "https://www.google.com"
grepl(testExpr, testWWW)
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