无法使用其他符号字符串定义符号值。
You cannot define a symbol value using other symbol strings.
从技术角度而言,正则表达式是表示某种模式的字符串(也就是说,由字母、数字和符号组成的字符序列),用于定义零或更长的字符串。
Technically speaking, a regular expression is a string (that is, a sequence of characters composed of letters, Numbers, and symbols) that represents a pattern defining zero or more strings.
从技术角度而言,正则表达式是表示某种模式的字符串(也就是说,由字母、数字和符号组成的字符序列),用于定义零或更长的字符串。
Technically speaking, a regular expression is a string (that is, a sequence of characters composed of letters, Numbers, and symbols) that represents a pattern defining zero or more strings.
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