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ABC is a music notation; I'm working on patterns to parse it as part of an app.

Sometimes multiple renditions of a tune are in an ABC file, and I need to get just the first rendition -- or in an ideal world any rendition I specify. The beginning of a rendition is signified by the X: string.

It's not possible to know in advance how many renditions are in a file.

In Javascript, how can I return, for example, the first rendition (from the first X: inclusive to the beginning of the second) in the example below, in a way that will return the first if there is no second, and return the first if there are more than two renditions.

My work so far yields ([\s\S]*)(?=X:) which succeeds in the two rendition example, but fails with a single rendition or more than two.

Adding an 'OR'd end of file condition to the lookahead lets the single rendition case work, but fails on the one and three rendition cases, e.g. \([\s\S]*)(?=X:|$)

Any help appreciated ... a good way to parse ABC will be used by many.

A two-rendition example can look like the below -- for a three rendition example just add a line with X: at the end, and for a single chop off everything from the second X:

EDITS: Folks have been kind enough to ask for better examples, and they won't fit in a comment, so here's a few

Broken pledge is interesting because it has more than one ABC and they're not numbered sequentially:

I have implemented a Xdnd drop support implementation in VTK some time ago. It was working great except with Thunar file manager. All other file managers were working fine at the time. We dismissed this limitation a Thunar bug at the time.

The feature I implemented was very simple:

• Set the window of the application to be XdndAware
• Receive the position message and respond that we are ready to receive
• Receive the drop mesage and request a selection
• Receive the selection notify and recover the URI
• Convert the URI into something we can work with

Nothing fancy, I did not even touch the list type.

Fast forward a few years and now dolphin users cannot drop files correctly into our application. The URI is always the first file dropped since dolphin was started. Restarting our application has no effect. No bug at all with pcmanfm.

This is not a dolphin bug and files can be dropped on blender or firefox from dolphin without issues.

So there must be a bug in our implementation, but I've been staring at the code for some time and everything I tried had no effect, except for breaking Xdnd support completely.

Here are the interesting part of the implementation:

I am new to Constraint programming and to MiniZinc I want to define the constraints for the following problem. Can you help me

3 Arrays F1,F2 and F3 have child elements (F1a,F1b) ; (F2a,F2b,F2c) ; (F3a,F3b,F3c,F3d) respectively.

I need to define constraints with below rules

*Need to Pick 1 element from each Family F1 and F3 with F2b included in all possible solutions

• F2b and F1a cannot coexist in a solution
• F2b and F3b cannot coexist in a solution
• F1a F2b and F3a cannot coexist in a solution

I need to find possible solutions

Thanks

My Actual Problem has 650 Arrays like F1,F2,... and have 75000 constraints like what i stated. Will I run into performance issue if extend the same logic given below by Alex/Dekker ?. what should be rigth approach to solve problems of this magnitude THanks

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