As described in Dynamic Link Manager filter rules, filters can refer to the source code from where the link is going (i.e. the bookmark) using a Regular Expression string:
This can be explained using the following image:
The default tab setting value is set to 4 and this cannot be modified. For programming languages that work with a different tab setting value, the filters leftStringFromCode and rightStringFromCode may NOT work correctly. In this case, as a workaround, CAST suggests using only rawStringFromCode, which is not tab sensitive.
Take the following code:
This would give the following:
Dynamic Link Manager filter rules