/test/mjsunit/regexp-compile.js

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// Test that we don't cache the result of a regexp match across a
// compile event.
var re = /x/;
assertEquals("a.yb", "axyb".replace(re, "."));

re.compile("y");
assertEquals("ax.b", "axyb".replace(re, "."));

re.compile("(x)");

assertEquals(["x", "x"], re.exec("axyb"));

re.compile("(y)");

assertEquals(["y", "y"], re.exec("axyb"));

assertEquals(2, re.compile.length);

// If RegExp parsing fails, the RegExp is not modified
var r = /./; try { r.compile('? invalid'); } catch(err){}
assertEquals("/./", r.toString());