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# 5.30. simple Filter

## Interface

    !block simple [;parameters]
    ...
    !endblock

The parameters are:

Name | Description
pre | Perl code to execute before the block
exec | executed for each line with $line containing the text line
post | Perl code to execute after the block

## Description

The simple filter is typically used as a building block for other filters. It provides a simple way of specifying the before (pre), per-line (exec) and after (post) actions.

Note: As creating new filters is not something that the average SDF users does, this filter is really provided to make life easier for advanced SDF users and SDF administrators.

## Examples

    !on filter "testcases";; \
            $name='simple'; \
            $params.=';pre="!testcaseStart"'; \
            $params.=';post="!testcaseEnd"'