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Question

我很难用以下标准创建一个功能regex：

• 只在“$”符号后面和句子末尾的空格或之前(空字符串或peroid‘.“)识别最多5个小写字符。
• 并匹配最多5个大写字母或前面没有“$”号的OR，后面必须跟着空格、符号(逗号、感叹号)或句子末尾(空字符串或peroid‘.)
• 如果有任何匹配的话

匹配实例

“$APPL落在了TSLA身上。”(应该匹配$APPL和TSLA) "$gme是一个类人猿游戏“(只应该匹配$gme)”这是一个$money的游戏。在哪里兰博“(应该匹配$money和LAMBO)

我一直在玩下面的游戏，让一些角色开始工作，但从来没有一蹴而就：

const found = [
    "this is an APPL",
    "this is an APPL.",
    "this is an $APPL",
    "this is an $appl",
    "this is an $appl.",
    "this is an $appl and orange.",
    "this is an $appl, and orange.",
    "this is an $APPL and orange.",
    "this is an $APPL, and orange.",
    "this is an APPL! and orange."
];

const notFound = [
    "this is an appl.",
    "this is an $applasdfasdf.",
    "this is an APPLLLLLL",
    "this is an $APPLLLLLL"
];

const matchTicker = /[$][A-Za-z]{0,5}/;

// Should evaluate to TRUE
console.log("\nFOUND\n");
found.forEach((ticker) => {
    console.log(matchTicker.test(ticker));
});

// Should evaluate to FALSE
console.log("\nNOT FOUND\n");
notFound.forEach((ticker) => {
    console.log(matchTicker.test(ticker));
});

Answer 1

这对你有用吗？

\$[a-z]{2,5}\b|\$?\b[A-Z]{2,5}\b

RegEx演示

RegEx解释：

• \$[a-z]{2,5}\b：第一个小写字母大写
• |：或
• \$?\b[A-Z]{2,5}\b：第二个大写字母大写字母