Re: New "cut" operator (was: Pike 8.0 RC1)

Excerpts from 郭雪松's message of 2014-11-16 17:18:07 +0100:
> > "cut left example" << " " == " left example"
> That is useless.

well, yes, but it demonstrates why << and >> are not a good fit for this operation.

consider "cut left example" << "left"

i would not expect this to return " example", but instead i would expect "left example"

> what I really need is the feature of "between", just like this:

> "<some thing>" << "<" >> ">" == "some thing"
> "<title>TITLE</title>" << "<" >> ">"=="titile"
> "<title>TITLE</title>"[sizeof("title")+2..]=="TITLE</title>"
> "TITLE</title>" >> "<"=="TITLE"
> "TITLE</title>"[sizeof("TITLE")..]=="</title>"

even with added spaces those examples don't feel very readable.

consider instead:

string chomp(string in, void|string cutleft, void|string cutright);
{   /* implementation of this function is left to the reader */   }

chomp("<some thing>", "<", ">") == "some thing";
chomp("<title>TITLE</title>", ">", "<") == "TITLE";
chomp("TITLE</title>", 0, "<") == "TITLE";
chomp("TITLE</title>", "TITLE") == "</title>";

greetings, martin.

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