允许标点符号和单词之间空格的正则表达式

Question

我想要一个防止空白的正则表达式，只允许带标点符号的字母和数字（西班牙语）。下面的正则表达式工作得很好，但是它不允许标点符号。

^[a-zA-Z0-9_]+( [a-zA-Z0-9_]+)*$

例如，当使用这个正则表达式时，“Hola como estas”是可以的，但是“Hola，como estas？”不匹配。

如何将其调整为标点符号？

Answer 1

使用\W代替空格，并在末尾添加\W*：

/^[a-zA-Z0-9_]+(?:\W+[a-zA-Z0-9_]+)*\W*$/

见证据

解释

                         EXPLANATION
--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  [a-zA-Z0-9_]+            any character of: 'a' to 'z', 'A' to 'Z',
                           '0' to '9', '_' (1 or more times (matching
                           the most amount possible))
--------------------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
--------------------------------------------------------------------------------
    \W+                      non-word characters (all but a-z, A-Z, 0-
                             9, _) (1 or more times (matching the
                             most amount possible))
--------------------------------------------------------------------------------
    [a-zA-Z0-9_]+            any character of: 'a' to 'z', 'A' to
                             'Z', '0' to '9', '_' (1 or more times
                             (matching the most amount possible))
--------------------------------------------------------------------------------
  )*                       end of grouping
--------------------------------------------------------------------------------
  \W*                      non-word characters (all but a-z, A-Z, 0-
                           9, _) (0 or more times (matching the most
                           amount possible))
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string