phrase method
Implementation
RegExpRecipe phrase(String string) {
var inner = _augment(
exactly(string),
(expr) => expr.replaceAll(r" ", r"\s+"),
);
return concat([
behindIs(either([
startsWith(nothing),
_nonWordChar,
])),
inner,
aheadIs(either([
_nonWordChar,
endsWith(nothing),
])),
]);
}