blocks|key|703521|text|您可以将字符串与相同的字符串进行比较，但以大写字母表示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|703522|'go234'+==+'go234'.upcase++#=>+false
'GO234'+==+'GO234'.upcase++#=>+true|code-block|syntax|javascript|703523|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can compare the string with the same string but in uppercase:

<pre><code>'go234' == 'go234'.upcase #=&gt; false
'GO234' == 'GO234'.upcase #=&gt; true
</code></pre>

blocks|key|487888|text|a+=+"Go234"
a.match(/\p{Lower}/)+#+=>+#<MatchData+"o">

b+=+"GO234"
b.match(/\p{Lower}/)+#+=>+nil

c+=+"123"
c.match(/\p{Lower}/)+#+=>+nil

d+=+"µ"
d.match(/\p{Lower}/)+#+=>+#<MatchData+"µ">|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|487889|因此，当匹配结果为nil时，它已经是大写的，否则就是小写的。|unstyled|487890|谢谢@mu太短了，我们应该使用/\p{+lower+}/来匹配非英文小写字母。|487891|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>a = "Go234"
a.match(/\p{Lower}/) # =&gt; #&lt;MatchData "o"&gt;

b = "GO234"
b.match(/\p{Lower}/) # =&gt; nil

c = "123"
c.match(/\p{Lower}/) # =&gt; nil

d = "µ"
d.match(/\p{Lower}/) # =&gt; #&lt;MatchData "µ"&gt;
</code></pre>

So when the match result is nil, it is in uppercase already, else something is in lowercase.

Thank you @mu is too short mentioned that we should use /\p{Lower}/ instead to match non-English lower case letters.

blocks|key|703610|text|您可以比较字符串和string.upcase是否相等(如JCorc所示)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|703611|irb(main):007:0>+str+=+"Go234"
=>+"Go234"
irb(main):008:0>+str+==+str.upcase
=>+false|code-block|syntax|javascript|703612|或|703613|你可以打电话给arg.upcase！检查是否为nil。(但这将修改原始参数，因此您可能需要创建一个副本)|703614|irb(main):001:0>+"GO234".upcase!
=>+nil
irb(main):002:0>+"Go234".upcase!
=>+"GO234"|703615|更新:如果你想让它在unicode上工作..(多字节)，那么string#upcase将不能工作，您将需要在this+SO+question中提到的unicode-util+gem|offset|length|703616|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1910573^0|0|0|0|0|0|1I|G|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

You could either compare the string and string.upcase for equality (as shown by JCorc..)

<pre><code>irb(main):007:0&gt; str = "Go234"
=&gt; "Go234"
irb(main):008:0&gt; str == str.upcase
=&gt; false
</code></pre>

OR

you could call arg.upcase! and check for nil. (But this will modify the original argument, so you may have to create a copy)

<pre><code>irb(main):001:0&gt; "GO234".upcase!
=&gt; nil
irb(main):002:0&gt; "Go234".upcase!
=&gt; "GO234"
</code></pre>

Update: If you want this to work for unicode.. (multi-byte), then string#upcase won't work, you'd need the unicode-util gem mentioned in <a href="https://stackoverflow.com/questions/1910573">this SO question</a>

blocks|key|703668|text|我正在使用@PeterWong的解决方案，只要您检查的字符串不包含任何特殊字符(如注释中所指出的)，它就很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|703669|但是，如果你想把它用于像“use”这样的字符串，只需稍微修改一下就行了：|703670|utf_pattern+=+Regexp.new("\\p{Lower}".force_encoding("UTF-8"))

a+=+"Go234"
a.match(utf_pattern)+#+=>+#<MatchData+"o">

b+=+"GO234"
b.match(utf_pattern)+#+=>+nil

b+=+"ÜÖ234"
b.match(utf_pattern)+#+=>+nil

b+=+"Über234"
b.match(utf_pattern)+#+=>+#<MatchData+"b">|code-block|syntax|javascript|703671|玩得开心!|703672|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I am using the solution by @PeterWong and it works great as long as the string you're checking against doesn't contain any special characters (as pointed out in the comments).

However if you want to use it for strings like "Überall", just add this slight modification:

<pre><code>utf_pattern = Regexp.new("\\p{Lower}".force_encoding("UTF-8"))

a = "Go234"
a.match(utf_pattern) # =&gt; #&lt;MatchData "o"&gt;

b = "GO234"
b.match(utf_pattern) # =&gt; nil

b = "ÜÖ234"
b.match(utf_pattern) # =&gt; nil

b = "Über234"
b.match(utf_pattern) # =&gt; #&lt;MatchData "b"&gt;
</code></pre>

Have fun!

I want to be able to check if a word is already all uppercase. And it might also include numbers.

Example:

<pre><code>GO234 =&gt; yes
Go234 =&gt; no
</code></pre>

How can I check a word is already all uppercase?

我希望能够检查一个单词是否已经全部大写。它还可能包含数字。示例：GO234 => yesGo234 => no

问如何检查已经全部大写的单词？
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