as.regexr.default: Coerce default to regexr
In regexr: Readable Regular Expressions

Convert a regular expression to a commented regexr object.

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## Default S3 method:
as.regexr(x, names = TRUE, comments = TRUE,
  names.above = FALSE, comments.below = FALSE, ...)

`x`	The object to be corced to `regexr`.
`names`	logical. Should names be included in the `construct` script?
`comments`	logical. Should comments be included in the `construct` script?
`names.above`	logical. Should ames be included above the sub-expressions in the `construct` script? If `FALSE` names are placed in front of the sub-expressions.
`comments.below`	logical. Should comments be included below the sub-expressions in the `construct` script? If `FALSE` comments are placed behind the sub-expressions.
`...`	Ignored.