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[[analysis-charfilters]]
== Character Filters
Character filters are used to preprocess the string of
characters before it is passed to the <<analysis-tokenizers,tokenizer>>.
A character filter may be used to strip out HTML markup, , or to convert
`"&"` characters to the word `"and"`.
Elasticsearch has built in characters filters which can be
used to build <<analysis-custom-analyzer,custom analyzers>>.
include::charfilters/mapping-charfilter.asciidoc[]
include::charfilters/htmlstrip-charfilter.asciidoc[]
include::charfilters/pattern-replace-charfilter.asciidoc[]
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