如果我有一个类似的公式：a+b-c*（exp（a*b））/3
我只想匹配变量（a，b，c）。对我来说，[a-zA-Z]+可以完成这项工作。但是我不想匹配exp函数。如何使用正则表达式实现这一点？我使用javascript。
([a-zA-Z]+)(?!s*()
更常见的可接受变量名概念是
([a-zA-Z_]w*)(?!s*()
函数名中有点后，它变成
(?:[^.]|^)([a-zA-Z]+)(?!(.|s*())
（变量将在第一个捕获匹配中）
将其更改为[A-z]将匹配不与其他字符相邻的单个A-z字母。
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