regex

README

Regex Processor Plugin

The regex plugin transforms tag and field values with regex pattern. If result_key parameter is present, it can produce new tags and fields from existing ones.

The regex processor only operates on string fields. It will not work on any other data types, like an integer or float.

For tags transforms, if append is set to true, it will append the transformation to the existing tag value, instead of overwriting it.

For metrics transforms, key denotes the element that should be transformed. Furthermore, result_key allows control over the behavior applied in case the resulting tag or field name already exists.

Configuration

# Transforms tag and field values as well as measurement, tag and field names with regex pattern
[[processors.regex]]
  namepass = ["nginx_requests"]

  # Tag and field conversions defined in a separate sub-tables
  [[processors.regex.tags]]
    ## Tag to change, "*" will change every tag
    key = "resp_code"
    ## Regular expression to match on a tag value
    pattern = "^(\\d)\\d\\d$"
    ## Matches of the pattern will be replaced with this string.  Use ${1}
    ## notation to use the text of the first submatch.
    replacement = "${1}xx"

  [[processors.regex.fields]]
    ## Field to change
    key = "request"
    ## All the power of the Go regular expressions available here
    ## For example, named subgroups
    pattern = "^/api(?P<method>/[\\w/]+)\\S*"
    replacement = "${method}"
    ## If result_key is present, a new field will be created
    ## instead of changing existing field
    result_key = "method"

  # Multiple conversions may be applied for one field sequentially
  # Let's extract one more value
  [[processors.regex.fields]]
    key = "request"
    pattern = ".*category=(\\w+).*"
    replacement = "${1}"
    result_key = "search_category"

  # Rename metric fields
  [[processors.regex.field_rename]]
    ## Regular expression to match on a field name
    pattern = "^search_(\\w+)d$"
    ## Matches of the pattern will be replaced with this string.  Use ${1}
    ## notation to use the text of the first submatch.
    replacement = "${1}"
    ## If the new field name already exists, you can either "overwrite" the
    ## existing one with the value of the renamed field OR you can "keep"
    ## both the existing and source field.
    # result_key = "keep"

  # Rename metric tags
  # [[processors.regex.tag_rename]]
  #   ## Regular expression to match on a tag name
  #   pattern = "^search_(\\w+)d$"
  #   ## Matches of the pattern will be replaced with this string.  Use ${1}
  #   ## notation to use the text of the first submatch.
  #   replacement = "${1}"
  #   ## If the new tag name already exists, you can either "overwrite" the
  #   ## existing one with the value of the renamed tag OR you can "keep"
  #   ## both the existing and source tag.
  #   # result_key = "keep"

  # Rename metrics
  # [[processors.regex.metric_rename]]
  #   ## Regular expression to match on an metric name
  #   pattern = "^search_(\\w+)d$"
  #   ## Matches of the pattern will be replaced with this string.  Use ${1}
  #   ## notation to use the text of the first submatch.
  #   replacement = "${1}"

Tags

No tags are applied by this processor.

Example

nginx_requests,verb=GET,resp_code=2xx request="/api/search/?category=plugins&q=regex&sort=asc",method="/search/",category="plugins",referrer="-",ident="-",http_version=1.1,agent="UserAgent",client_ip="127.0.0.1",auth="-",resp_bytes=270i 1519652321000000000

Documentation

Index

• type Regex
  • func (r *Regex) Apply(in ...telegraf.Metric) []telegraf.Metric
  • func (r *Regex) Init() error
  • func (*Regex) SampleConfig() string

Types

type Regex

type Regex struct {
	Tags         []converter     `toml:"tags"`
	Fields       []converter     `toml:"fields"`
	TagRename    []converter     `toml:"tag_rename"`
	FieldRename  []converter     `toml:"field_rename"`
	MetricRename []converter     `toml:"metric_rename"`
	Log          telegraf.Logger `toml:"-"`
	// contains filtered or unexported fields
}

func (*Regex) Apply

func (r *Regex) Apply(in ...telegraf.Metric) []telegraf.Metric

func (*Regex) Init

func (r *Regex) Init() error

func (*Regex) SampleConfig

func (*Regex) SampleConfig() string