[TxMt] Re: Conditional regex

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'.