regular expression

1. Safari handles positive lookbehind assertions in regular expressions, denoted by (?<=…), abnormally

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// The following code works fine in Chrome but throws an error in Safari.
"https://linlccc.com?theme=light".replace(/(?<=[?|&]theme=)\w+/, "dark");
// The solution is to use capturing groups and string replacement.
"https://linlccc.com?theme=light".replace(/([?|&]theme=)\w+/, "$1dark");

// Both of the execution results above are "https://linlccc.com?theme=dark"