You can use the

optional

property of a

Group

to prevent the Script from attempting to retrieve text from a missing section of a document.

For example, to parse the source

you might define

First name:

as a

Marker

and

Ron

as

Content

. If some source documents do not contain the first-name data, you can put the

Marker

and

Content

in a

Group

and make it optional. If

First name:

is not found, the

Group

immediately fails, and the Parser does not search for the

Content

anchor.

There is a difference between making the

Group

optional and making its nested anchors optional. If you make both the

Marker

and

Content

optional, instead of the

Group

, the Script ignores the

Marker

failure and searches for the

Content

. This might result in retrieving irrelevant text.