We're trying to count number of ampersands in a string efficiently using Regex. I know I can count them, by iterating, I need it in Regex form due a framework requirement.We're trying to count number of ampersands in a
阅读背景：
正则表达式有效地计算字符串中的＆符号数。通过字符串迭代不是一个选项
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