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Showing content from https://rstudio.github.io/shinyvalidate/reference/sv_url.html below:

Validate that a field contains a URL — sv_url • shinyvalidate

A validation function, suitable for use with InputValidator$add_rule(), that checks whether an input value is a valid URL.

sv_url(message = "Not a valid URL", allow_multiple = FALSE, allow_na = FALSE)

message

The validation error message to use if a value doesn't match a regex pattern for URL detection.

allow_multiple

If FALSE (the default), then the length of the input vector must be exactly one; if TRUE, then any length is allowed (including a length of zero; use sv_required() if one or more values should be required).

allow_na

If FALSE, then any NA element will cause validation to fail.

The sv_email() function, another specialized regex-based function for validating email addresses. For general regex-based validation the sv_regex() function is useful.

Other rule functions: compose_rules(), sv_between(), sv_email(), sv_equal(), sv_gte(), sv_gt(), sv_in_set(), sv_integer(), sv_lte(), sv_lt(), sv_not_equal(), sv_numeric(), sv_optional(), sv_regex(), sv_required()

## Only run examples in interactive R sessions
if (interactive()) {

library(shiny)
library(shinyvalidate)

ui <- fluidPage(
  textInput("url", "URL")
)

server <- function(input, output, session) {
  
  # Validation rules are set in the server, start by
  # making a new instance of an `InputValidator()`
  iv <- InputValidator$new()

  # Basic usage: `sv_url()` works well with its
  # defaults; a message will be displayed if the
  # validation of `input$address` fails
  iv$add_rule("url", sv_url())

  # Finally, `enable()` the validation rules
  iv$enable()
}

shinyApp(ui, server)

}

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