一行就足够了：
var x = '|f|oo||';
var y = x.replace(/^\|+|\|+$/g, '');
document.write(x + '<br />' + y);
^\|+ beginning of the string, pipe, one or more times
| or
\|+$ pipe, one or more times, end of the string
在功能上：
function trim (s, c) {
if (c === "]") c = "\\]";
if (c === "\\") c = "\\\\";
return s.replace(new RegExp(
"^[" + c + "]+|[" + c + "]+$", "g"
), "");
}
chars = ".|]\\";
for (c of chars) {
s = c + "foo" + c + c + "oo" + c + c + c;
console.log(s, "->", trim(s, c));
}
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