[tbraun84]

I haven't been able to find in the documentation a description of how matching multiple boundaries based on a pattern works, though I found out what works by examples and experimentation.

In the tutorials there are numerous examples of field files that have syntax like

"wall.*"
{
     zeroGradient;
     otherKey     otherValue;
}

I've found that a pattern like "wall*" does not actually match all of the boundaries beginning with "wall" but "wall.*" will match "wall_left" and "wall_right" even though those do not contain a dot/period character.

Can one explain what the ".*" does? Is this just the pattern for wildcard because regular asterisk is reserved by the interpreter (even within quotation marks)?

[Yann]

Hello,

Check the section 4.2.13 about regular expressions in the user guide:
https://doc.cfd.direct/openfoam/user...ic-file-format

Cheers,
Yann