问题描述
我想要一个防止空格的正则表达式，并且只允许带标点符号的字母和数字（西班牙语）。下面的正则表达式效果很好，但是不允许使用标点符号。
^[a-zA-Z0-9_]+( [a-zA-Z0-9_]+)*$
例如，当使用此正则表达式时，“ Hola como estas”很好，但是“ Hola，comoestás？”不匹配。
如何调整标点符号？
解决方法
使用\W+代替空格，并在末尾添加\W*
/^[a-zA-Z0-9_]+(?:\W+[a-zA-Z0-9_]+)*\W*$/
请参见proof
EXPLANATION
EXPLANATION
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^ 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','_' (1 or more times
(matching the most amount possible))
--------------------------------------------------------------------------------
)* end of grouping
--------------------------------------------------------------------------------
\W* non-word characters (all but a-z,0-
9,_) (0 or more times (matching the most
amount possible))
--------------------------------------------------------------------------------
$ before an optional \n,and the end of the
string