automatic metadata extaction from filenames

[kjdon]

From an email 28/03/08 from Pablo San Juan

I need your help. I´m testing Greenstone 2.80 release and I´m trying to use MetadataXMLPlug plugin in order to include automatic metadata to my collection files.

Here is an extract from metadata.xml file:

<DirectoryMetadata> <FileSet>

<FileName>\w{3}d\{8}\.pdf</FileName> <Description>

<Metadata mode="override" name="pren.Fecha">$1</Metadata>

</Description>

</FileSet>

It´s a newspaper´s collection. The filenames of my collection are like "ABC20080327.PDF"; the three first characters indicates newspaper abreviature, and next 8 characters indicate new date(year,month and day). In <Filename> tag I´m using a perl expression and I want to use its match to insert this value as new metadata value in metadata tag. How can I use $1 variable (the match result in perl expression) in Metadata tag?