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php - 匹配两个特定子字符串之一之前或之后的数字子字符串

我有一个程序可以从拥有Kč或CZK背后的链中选择一个金额。如何编辑表达式（模式）以检查是否Kč或CZK在数字前面？请参见字符串 1 和字符串 2：


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