Segment name must not contain +, nor -,

[sjackman]

Commas are used to separate segment IDs in a path.

Closes #37.

This clarification is suggested by @lh3 in #37 (comment)

My recommendation is for GFA1, we test regex pattern /[+-],/ at an S-line. If we find a match, we throw an error, saying the current spec does not allow it. I think this treatment is working most of time in practice. I have seen commas in sequence names, but I am yet to see a /[+-],/ pattern – it is very rare.

[ggonnella]

Great. Maybe we should also make clear that this requirement is not checked by the regular expression? (Because other limitations, such as that the name should not start with * or = are implied by it).

[sjackman]

As Heng Li @lh3 proposed this fix, we have three 👍. I'll merge on 2016-09-26.

[sjackman]

Great. Maybe we should also make clear that this requirement is not checked by the regular expression? (Because other limitations, such as that the name should not start with * or = are implied by it).

I'm starting to find the regular expressions more trouble than help.

[sjackman]

Merged.