str.replace(/s/g, '')
/正则表达式/ 这两个斜杠是JS正则表达式的规则
s 表示字符串中的空字符
g 表示全部匹配
The s
(lowercase s
) matches a whitespace (blank, tab
, form-feed f
and newline
or
).
On the other hand, the S+
(uppercase S
) matches anything that is not matched by s
, i.e., non-whitespace.
In regex, the uppercase metacharacter denotes the inverse of the lowercase counterpart, for example, w
for word character and W
for non-word character.
- The
s
(lowercases
) matches a whitespace (blank, tabf
and newlineS+
(uppercaseS
) matches anything that is not matched bys
, i.e., non-whitespace. In regex, the uppercase metacharacter denotes the inverse of the lowercase counterpart, for example,w
for word character andW
for non-word character.