编写一个函数，将单个camelCase格式的字符串转换为snake_case格式的字符串。
// A function camelToCase that takes a string (text) as the parameter.
function camelToCase(text) {
// Transform each uppercase letter (character) based on its position.
function upperToUnderScoreLower(character, position) {
// If the letter isn't the first character, add an underscore and convert it to lowercase.
return (position > 0 && "_") + match.toLowerCase();
}
// Replace all uppercase letters in (text) by calling the upperToUnderScoreLower function.
return text.replace(/[A-Z]/g, upperToUnderScoreLower);
}
console.log(camelToCase("camelToCase"));
> camel_to_case
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