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module Puppet::Parser::Functions
newfunction(
:regsubst, :type => :rvalue,
:doc => "
Perform regexp replacement on a string or array of strings.
- **Parameters** (in order):
:target: The string or array of strings to operate on. If an array, the replacement will be performed on each of the elements in the array, and the return value will be an array.
:regexp: The regular expression matching the target string. If you want it anchored at the start and or end of the string, you must do that with ^ and $ yourself.
:replacement: Replacement string. Can contain back references to what was matched using \\0, \\1, and so on.
:flags: Optional. String of single letter flags for how the regexp is interpreted:
- **E** Extended regexps
- **I** Ignore case in regexps
- **M** Multiline regexps
- **G** Global replacement; all occurrences of the regexp in each target string will be replaced. Without this, only the first occurrence will be replaced.
:lang: Optional. How to handle multibyte characters. A single-character string with the following values:
- **N** None
- **E** EUC
- **S** SJIS
- **U** UTF-8
- **Examples**
Get the third octet from the node's IP address::
$i3 = regsubst($ipaddress,'^([0-9]+)[.]([0-9]+)[.]([0-9]+)[.]([0-9]+)$','\\3')
Put angle brackets around each octet in the node's IP address::
$x = regsubst($ipaddress, '([0-9]+)', '<\\1>', 'G')
") \
do |args|
unless args.length.between?(3, 5)
raise(
Puppet::ParseError,
"regsubst(): got #{args.length} arguments, expected 3 to 5")
end
target, regexp, replacement, flags, lang = args
reflags = 0
operation = :sub
if flags == nil
flags = []
elsif flags.respond_to?(:split)
flags = flags.split('')
else
raise(
Puppet::ParseError,
"regsubst(): bad flags parameter #{flags.class}:`#{flags}'")
end
flags.each do |f|
case f
when 'G' then operation = :gsub
when 'E' then reflags |= Regexp::EXTENDED
when 'I' then reflags |= Regexp::IGNORECASE
when 'M' then reflags |= Regexp::MULTILINE
else raise(Puppet::ParseError, "regsubst(): bad flag `#{f}'")
end
end
begin
re = Regexp.compile(regexp, reflags, lang)
rescue RegexpError, TypeError
raise(
Puppet::ParseError,
"regsubst(): Bad regular expression `#{regexp}'")
end
if target.respond_to?(operation)
# String parameter -> string result
result = target.send(operation, re, replacement)
elsif target.respond_to?(:collect) and
target.respond_to?(:all?) and
target.all? { |e| e.respond_to?(operation) }
# Array parameter -> array result
result = target.collect { |e|
e.send(operation, re, replacement)
}
else
raise(
Puppet::ParseError,
"regsubst(): bad target #{target.class}:`#{target}'")
end
return result
end
end
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