Checks if valid parameter names.
Usage
chk_pars(x, x_name = NULL)
vld_pars(x)
Arguments
- x
An object.
- x_name
A string of the name of object x or NULL.
Value
The chk_ function throws an informative error if the test fails.
The vld_ function returns a flag indicating whether the test was met.
Details
The character vector must consist of values that start with an alpha
and only include alphanumeric characters and '_' or '.'.
Missing values and duplicates are permitted.
Examples
x <- c("x", "a1._", "X")
chk_pars(x)
y <- c("x[1]", "a1", "a1", "._0")
try(chk_pars(y))
#> Error in chk_pars(y) :
#> `y` must have values matching regular expression '^[[:alpha:]][[:alnum:]._]*$'.
vld_pars(c("x", "a1._", "X"))
#> [1] TRUE
vld_pars(c("x[1]", "a1", "a1", "._0"))
#> [1] FALSE
