I have a input dialog that asks for XML element name, and I want to check it to see if it has any spaces.
我有一个输入对话框，询问XML元素名称，我想检查它是否有任何空格。
can I do something like name.matches()?
我可以做name.matches（）这样的事情吗？
5 个解决方案
#1
32
Why use a regex?
为什么要使用正则表达式？
name.contains(" ")
That should work just as well, and be faster.
这应该同样有效，并且更快。
#2
4
string name = "Paul Creasey";
if (name.contains(" ")) {
}
#3
4
If you will use Regex, it already has a predefined character class "\S" for any non-whitespace character.
如果您将使用Regex，它已经为任何非空白字符预定义了字符类“\ S”。
!str.matches("\\S+")
tells you if this is a string of at least one character where all characters are non-whitespace
告诉您这是否是至少一个字符的字符串，其中所有字符都是非空格
#4
2
if (str.indexOf(' ') >= 0)
would be (slightly) faster.
会（稍微）更快。
#5
1
If you really want a regex, you can use this one:
如果你真的想要一个正则表达式，你可以使用这个：
str.matches(".*([ \t]).*")
In the sense that everything matching this regex is not a valid xml tag name:
从某种意义上说，匹配此正则表达式的所有内容都不是有效的xml标记名称：
if(str.matches(".*([ \t]).*"))
print "the input string is not valid"
#1
32
Why use a regex?
为什么要使用正则表达式？
name.contains(" ")
That should work just as well, and be faster.
这应该同样有效，并且更快。
#2
4
string name = "Paul Creasey";
if (name.contains(" ")) {
}
#3
4
If you will use Regex, it already has a predefined character class "\S" for any non-whitespace character.
如果您将使用Regex，它已经为任何非空白字符预定义了字符类“\ S”。
!str.matches("\\S+")
tells you if this is a string of at least one character where all characters are non-whitespace
告诉您这是否是至少一个字符的字符串，其中所有字符都是非空格
#4
2
if (str.indexOf(' ') >= 0)
would be (slightly) faster.
会（稍微）更快。
#5
1
If you really want a regex, you can use this one:
如果你真的想要一个正则表达式，你可以使用这个：
str.matches(".*([ \t]).*")
In the sense that everything matching this regex is not a valid xml tag name:
从某种意义上说，匹配此正则表达式的所有内容都不是有效的xml标记名称：
if(str.matches(".*([ \t]).*"))
print "the input string is not valid"