Puppet Function: validate_re

Defined in:
puppet/modules/stdlib/lib/puppet/parser/functions/validate_re.rb
Function type:
Ruby 3.x API

Overview

validate_re()Any

Perform simple validation of a string against one or more regular expressions. The first argument of this function should be a string to test, and the second argument should be a stringified regular expression (without the // delimiters) or an array of regular expressions. If none of the regular expressions match the string passed in, compilation will abort with a parse error.

If a third argument is specified, this will be the error message raised and seen by the user.

The following strings will validate against the regular expressions:

validate_re('one', '^one$')
validate_re('one', [ '^one', '^two' ])

The following strings will fail to validate, causing compilation to abort:

validate_re('one', [ '^two', '^three' ])

A helpful error message can be returned like this:

validate_re($::puppetversion, '^2.7', 'The $puppetversion fact value does not match 2.7')

Note: Compilation will also abort, if the first argument is not a String. Always use quotes to force stringification:

validate_re("${::operatingsystemmajrelease}", '^[57]$')

Returns:

  • (Any)


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# File 'puppet/modules/stdlib/lib/puppet/parser/functions/validate_re.rb', line 2

newfunction(:validate_re, :doc => <<-'ENDHEREDOC') do |args|

  function_deprecation([:validate_re, 'This method is deprecated, please use the stdlib validate_legacy function, with Stdlib::Compat::Re. There is further documentation for validate_legacy function in the README.'])
  Perform simple validation of a string against one or more regular
  expressions. The first argument of this function should be a string to
  test, and the second argument should be a stringified regular expression
  (without the // delimiters) or an array of regular expressions.  If none
  of the regular expressions match the string passed in, compilation will
  abort with a parse error.

  If a third argument is specified, this will be the error message raised and
  seen by the user.

  The following strings will validate against the regular expressions:

      validate_re('one', '^one$')
      validate_re('one', [ '^one', '^two' ])

  The following strings will fail to validate, causing compilation to abort:

      validate_re('one', [ '^two', '^three' ])

  A helpful error message can be returned like this:

      validate_re($::puppetversion, '^2.7', 'The $puppetversion fact value does not match 2.7')

  Note: Compilation will also abort, if the first argument is not a String. Always use
  quotes to force stringification:

      validate_re("${::operatingsystemmajrelease}", '^[57]$')

  ENDHEREDOC

  if (args.length < 2) or (args.length > 3) then
    raise Puppet::ParseError, "validate_re(): wrong number of arguments (#{args.length}; must be 2 or 3)"
  end

  raise Puppet::ParseError, "validate_re(): input needs to be a String, not a #{args[0].class}" unless args[0].is_a? String

  msg = args[2] || "validate_re(): #{args[0].inspect} does not match #{args[1].inspect}"

  # We're using a flattened array here because we can't call String#any? in
  # Ruby 1.9 like we can in Ruby 1.8
  raise Puppet::ParseError, msg unless [args[1]].flatten.any? do |re_str|
    args[0] =~ Regexp.compile(re_str)
  end

end