Parameters can defined using the '%' prefix character

[Arnauld]

Parameters are defined using the '%' prefix whereas the documentation indicates:

The simplest default behaviour identifies arguments in the candidate step by the words
prefixed by the $character. -- http://jbehave.org/reference/stable/developing-stories.html

[Arnauld]

In fact configuration allows to setup any StepPatternParser implementation, and predefined one allows to customized the prefix:

return new MostUsefulConfiguration()
            ...
            // use '%' instead of '$' to identify parameters
            .useStepPatternParser(new RegexPrefixCapturingPatternParser("%")) 
            ...

From TraderStories.java

Currently the only implementation available is RegexPrefixCapturingPatternParser which accepts different prefix, according to this, a new option should be added in project preferences to define the prefix used within the whole project. If a more fine grained setting is required, preference should be added on a per editor basis, which won't be done for now.

[Arnauld]

This would be a temporary solution until the possibility to associate a dedicated Runner to a story is available.

Note for myself: The runner will be responsible for configuring the JBehave Embedder in such way it could be used by the plugin to analyse available classes and figure out all candidates steps. One mustn't forget that the plugin would probably not be working at JDT level but at class level: performance would probably be impacted...

[Arnauld]

Done in master should be available in 1.0.7
Preferences allow to define the wanted prefix on a per project (or general too) basis