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Copy file name to clipboardExpand all lines: docs/reference/enrich-processor/dissect-processor.md
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A dissect pattern is defined by the parts of the string that will be discarded. In the previous example, the first part to be discarded is a single space. Dissect finds this space, then assigns the value of `clientip` everything up until that space. Next, dissect matches the `[` and then `]` and then assigns `@timestamp` to everything in-between `[` and `]`. Paying special attention to the parts of the string to discard will help build successful dissect patterns.
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Successful matches require all keys in a pattern to have a value. If any of the `%{{keyname}}` defined in the pattern do not have a value, then an exception is thrown and may be handled by the [`on_failure`](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#handling-pipeline-failures) directive. An empty key `%{}` or a [named skip key](#dissect-modifier-named-skip-key) can be used to match values, but exclude the value from the final document. All matched values are represented as string data types. The [convert processor](/reference/enrich-processor/convert-processor.md) may be used to convert to expected data type.
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Successful matches require all keys in a pattern to have a value. If any of the `%{keyname}` defined in the pattern do not have a value, then an exception is thrown and may be handled by the [`on_failure`](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#handling-pipeline-failures) directive. An empty key `%{}` or a [named skip key](#dissect-modifier-named-skip-key) can be used to match values, but exclude the value from the final document. All matched values are represented as string data types. The [convert processor](/reference/enrich-processor/convert-processor.md) may be used to convert to expected data type.
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Dissect also supports [key modifiers](#dissect-key-modifiers) that can change dissect’s default behavior. For example you can instruct dissect to ignore certain fields, append fields, skip over padding, etc. See [below](#dissect-key-modifiers) for more information.
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## Dissect key modifiers [dissect-key-modifiers]
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Key modifiers can change the default behavior for dissection. Key modifiers may be found on the left or right of the `%{{keyname}}` always inside the `%{` and `}`. For example `%{+keyname ->}` has the append and right padding modifiers.
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Key modifiers can change the default behavior for dissection. Key modifiers may be found on the left or right of the `%{keyname}` always inside the `%{` and `}`. For example `%{+keyname ->}` has the append and right padding modifiers.
### Right padding modifier (`->`) [dissect-modifier-skip-right-padding]
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The algorithm that performs the dissection is very strict in that it requires all characters in the pattern to match the source string. For example, the pattern `%{{fookey}} %{{barkey}}` (1 space), will match the string "foo bar" (1 space), but will not match the string "foo bar" (2 spaces) since the pattern has only 1 space and the source string has 2 spaces.
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The algorithm that performs the dissection is very strict in that it requires all characters in the pattern to match the source string. For example, the pattern `%{fookey} %{barkey}` (1 space), will match the string "foo bar" (1 space), but will not match the string "foo bar" (2 spaces) since the pattern has only 1 space and the source string has 2 spaces.
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The right padding modifier helps with this case. Adding the right padding modifier to the pattern `%{fookey->} %{{barkey}}`, It will now will match "foo bar" (1 space) and "foo bar" (2 spaces) and even "foo bar" (10 spaces).
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The right padding modifier helps with this case. Adding the right padding modifier to the pattern `%{fookey->} %{barkey}`, It will now will match "foo bar" (1 space) and "foo bar" (2 spaces) and even "foo bar" (10 spaces).
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Use the right padding modifier to allow for repetition of the characters after a `%{keyname->}`.
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