[TxMt] Re: Conditional regex

[Steve King]

Dijk van Marc wrote:
> A PDB file is essentially a table. One line from such a table can be
> as follows:
>
> ATOM     14  CA  GLN A   2     -27.648  -9.581  30.325  1.00 10.00
>
> In the language description I would like to use a regular expression
> construct that 
> matched 'GLN' only if the line starts with either 'ATOM' or 'HETATM'.
> This seams like
> a conditional regular expression but my attempts to implement it at
> such have failed
> so far.
>
> Can anyone help?

Is this what you mean?

    ^(ATOM|HETATM).*GLN

This will match any line which starts with either 'ATOM' or 'HETATM',
followed by any string of arbitrary characters, followed by the string
'GLN'.



-- 
Steve King
Sr. Software Engineer
Arbor Networks
+1 734 821 1461
www.arbornetworks.com <http://www.arbornetworks.com/>