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Elaborate on backslash escaping in gsub. #87

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Elaborate on backslash escaping in gsub. #87

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6 changes: 5 additions & 1 deletion lib/logstash/filters/mutate.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,9 @@ class LogStash::Filters::Mutate < LogStash::Filters::Base
# This configuration takes an array consisting of 3 elements per
# field/substitution.
#
# Be aware of escaping any backslash in the config file.
# Be aware of escaping any literal backslash in the config file.
# However, use a single backslash for predefined character classes like \d
# as well as for backreferences to capture groups like \1.
#
# Example:
# [source,ruby]
Expand All @@ -81,6 +83,8 @@ class LogStash::Filters::Mutate < LogStash::Filters::Base
# gsub => [
# # replace all forward slashes with underscore
# "fieldname", "/", "_",
# # left-pad with a zero if it is a single digit
# "numstr", "^(\d)$", "0\1",
# # replace backslashes, question marks, hashes, and minuses
# # with a dot "."
# "fieldname2", "[\\?#-]", "."
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