regex - 正则表达式 : numbers spaces parentheses +

Question

我需要一个正则表达式，其中允许以任何顺序使用空格、括号和连字符的任何数字。但是有必须最后是“+”(加号)。

Answer 1

您可以使用正则表达式:

^[\d() -]+\+$

解释:

^   : Start anchor
[   : Start of char class.
 \d : Any digit
 (  : A literal (. No need to escape it as it is non-special inside char class.
 )  : A literal )
    : A space
 -  : A hyphen. To list a literal hyphen in char class place it at the beginning
      or at the end without escaping it or escape it and place it anywhere.
]   : End of char class
+   : One or more of the char listed in the char class.
\+  : A literal +. Since a + is metacharacter we need to escape it.
$   : End anchor