blocks|key|3085960|text|您也可以使用/[a-z]/i或/[[:alpha:]]/。事实上，\w包含了数字，所以这甚至不起作用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3085961|entityMap^0|6|8|F|D|X|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

You could use <code>/[a-z]/i</code> or <code>/[[:alpha:]]/</code> just as well. In fact, <code>\w</code> includes numbers so that won't even work.

blocks|key|4496337|text|也许你指的是/[[:alpha:]]/？有关perlre字符类的讨论，请参阅POSIX。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4496338|entityMap|0|LINK|mutability|MUTABLE|url|http://perldoc.perl.org/perlre.html^0|6|D|M|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Perhaps you mean <code>/[[:alpha:]]/</code>? See <a href="http://perldoc.perl.org/perlre.html" rel="noreferrer">perlre</a> for the discussion of POSIX character classes.

blocks|key|1060287|text|只要使用\p{L}就可以了，它的意思是“任何Unicode字母”，并且适用于Perl+(/\p{L}/)。您可能需要use+utf8;。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1060288|entityMap^0|4|5|18|7|1M|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Just use <code>\p{L}</code> which means "any Unicode letter" and works in Perl (<code>/\p{L}/</code>). You probably need to <code>use utf8;</code>.

blocks|key|3086075|text|匹配国际(即非ASCII)字符有点困难，而且可能依赖于很多东西。看看这个例子：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3086076|#!perl+-w

use+strict;
use+utf8;

my+$string+=+"ä";

print+"matched+:alpha:\n"++if+$string+=~+/[[:alpha:]]/;
print+"matched+%5E\\W0-9_\n"+if+$string+=~+/[%5E\W0-9_]/;
print+"matched+[a-zA-Z]\n"+if+$string+=~+/[a-zA-Z]/;
print+"matched+[a-z]i\n"+++if+$string+=~+/[a-z]/i;
print+"matched+[A-z]\n"++++if+$string+=~+/[A-z]/;|code-block|syntax|javascript|3086077|对我来说，这会导致|3086078|matched+:alpha:|3086079|如果删除use+utf8，则所有正则表达式都不匹配。|offset|length|style|CODE|3086080|看一下this+very+relevant+question，看起来您可能想要use+utf8并查看Unicode::Semantics。|3086081|当然，如果您使用的是直接的ASCII字符，那么前面提到的任何正则表达式都可以工作。|3086082|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1553215/locale-aware-perl-regular-expressions-matching-word-boundaries|1|http://search.cpan.org/perldoc/Unicode::Semantics^0|0|0|0|0|4|8|0|13|8|3|R|0|1E|I|1|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|18|8|@$M|19|N|1A|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@$M|1C|N|1D|O|P]]|9|@$M|1E|N|1F|1|1G]|$M|1H|N|1I|1|1J]]|A|$]]|$1|S|3|T|5|6|7|1K|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]]]

Matching international (i.e non-ASCII) characters is kind of tough, and could depend on a lot of things. Check out this example:

<pre><code>#!perl -w

use strict;
use utf8;

my $string = "ä";

print "matched :alpha:\n" if $string =~ /[[:alpha:]]/;
print "matched ^\\W0-9_\n" if $string =~ /[^\W0-9_]/;
print "matched [a-zA-Z]\n" if $string =~ /[a-zA-Z]/;
print "matched [a-z]i\n" if $string =~ /[a-z]/i;
print "matched [A-z]\n" if $string =~ /[A-z]/;
</code></pre>

For me this results in

<pre><code>matched :alpha:
</code></pre>

If you remove the <code>use utf8</code> then none of the regular expressions match.

Looking at <a href="https://stackoverflow.com/questions/1553215/locale-aware-perl-regular-expressions-matching-word-boundaries">this very relevant question</a>, it looks like you probably want to <code>use utf8</code> and check out <a href="http://search.cpan.org/perldoc/Unicode::Semantics" rel="nofollow noreferrer">Unicode::Semantics</a>.

Of course, if you're using straight ASCII characters than any of the aforementioned regular expressions will work.

blocks|key|1805515|text|[%5E\W0-9_]

#+or

[[:alpha:]]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1805516|请参阅perldoc+perlre|unstyled|offset|length|1805517|entityMap|0|LINK|mutability|MUTABLE|url|http://perldoc.perl.org/perlre.html^0|0|B|6|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>[^\W0-9_]

# or

[[:alpha:]]
</code></pre>

See perldoc <a href="http://perldoc.perl.org/perlre.html" rel="nofollow noreferrer">perlre</a>

blocks|key|3086026|text|以下是几个选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3086027|1.+/[a-z]/i+++++++++++++++#+case+insensitive
2.+/[A-Z]/i+++++++++++++++#+case+insensitive
3.+/[A-z]/++++++++++++++++#+explicit+range+listing+(capital+'A'+to+lowercase+'z')
4.+/[[:alpha:]]/++++++++++#+POSIX+alpha+character+class|code-block|syntax|javascript|3086028|我建议使用不区分大小写的或真正的/[a-zA-z]/方式，除非您有特定的语言偏好。|offset|length|style|CODE|3086029|备注：|BOLD|3086030|由于ASCII值的顺序，编号为3的|3086031|要求先使用大写字母'A‘，然后再使用小写字母'z’；反之亦然：a-Z。此外:此方法将不符合无下划线标准，因为它包含+\%5E_+`。|unordered-list-item|3086032|4将匹配这些额外的语言字符，但它也匹配：|3086033|3086034|ʹʺʻˍˎˏːˑˬˮ̀́+(以及其他许多人)|3086035|entityMap^0|0|0|G|A|0|0|3|0|0|V|3|1L|6|0|0|0|0|C|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@$I|14|J|15|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|16|8|@$I|17|J|18|K|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1A|8|@$I|1B|J|1C|K|L]|$I|1D|J|1E|K|O]]|9|@]|A|$]]|$1|U|3|V|5|T|7|1F|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1H|8|@$I|1I|J|1J|K|L]]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|10|$]]

A few options: 

<pre><code>1. /[a-z]/i # case insensitive
2. /[A-Z]/i # case insensitive
3. /[A-z]/ # explicit range listing (capital 'A' to lowercase 'z')
4. /[[:alpha:]]/ # POSIX alpha character class
</code></pre>

I recommend using either the case-insensitive, or the true way <code>/[a-zA-z]/</code>, unless you have a certain language preference in mind.

Note: 

<ul>
<li>Number 3 requires the capital 'A' first and then lowercase 'z' because of the order of the ASCII values; it does not work if you do the reverse: <code>a-Z</code>. Also: this method would fail the no-underscore criteria, since it includes [ \ ] ^ _ ` .</li>
<li>Number 4 will match on those additional language characters, but it also matches on: 
<code>ʹʺʻˍˎˏːˑˬˮ̀́</code> &nbsp; (plus many others)</li>
</ul>

blocks|key|1805534|text|您希望在您的regex中实现国际化吗？然后你需要做一些像这个人做的事情：JavaScript+validation+issue+with+international+characters|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1805535|显式匹配所有月球语言字母:)|1805536|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1073412/javascript-validation-issue-with-international-characters^0|10|1L|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

you're looking for internationalization in your regex? then you'll need to do something like this guy did: <a href="https://stackoverflow.com/questions/1073412/javascript-validation-issue-with-international-characters">JavaScript validation issue with international characters</a>

explicitly match on all of the moon language letters :)

I would really like to use \w but it also matches underscores so I'm going with [A-Za-z] which feels unnecessarily verbose and America centric. Is there a better way to do this? Something like [\w^_] (I doubt I got that syntax right)?

What is the best way to match only letters in a regex?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我真的很想使用\w，但它也匹配下划线，所以我使用A-Za-z，这感觉不必要的冗长和以美国为中心。有没有更好的方法来做这件事？像这样的东西

问在正则表达式中仅匹配字母的最佳方法是什么？
EN

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问在正则表达式中仅匹配字母的最佳方法是什么？EN

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问在正则表达式中仅匹配字母的最佳方法是什么？
EN