regex - 完全匹配 Perl 字符串中包含的以 $(或特殊字符)开头的单词

Question

如何从字符串中精确匹配像 $abc 这样的单词 "this is $$abc abc$abc $abc abc_$abc_ing";

Answer 1

您可以使用正则表达式:

(\$[a-z]+)

说明:

(        : Start of group
  \$     : A literal $. Since $ is a metacharacter we escape it.
  [a-z]+ : one or more letters that is a word. You can use the modifier i 
           to match uppercase letters aswell.
)        : End of grouping