blocks|key|2591440|text|请尝试以下操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2591441|%5E([0-2][0-3]:[0-5][0-9])%7C(0?[0-9]:[0-5][0-9])$|code-block|syntax|javascript|2591442|注意:我假设使用的是javascript+regex引擎。如果不是这样的话请告诉我。|2591443|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try the following

<pre><code>^([0-2][0-3]:[0-5][0-9])|(0?[0-9]:[0-5][0-9])$
</code></pre>

Note: I was assuming the javascript regex engine. If it's different than that please let me know.

blocks|key|4206533|text|您最初的正则表达式有缺陷:例如，它与04:00不匹配。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4206534|这可能会更好地工作：|4206535|%5E([0-1]?[0-9]%7C2[0-3]):[0-5][0-9]$|code-block|syntax|javascript|4206536|entityMap^0|I|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Your original regular expression has flaws: it wouldn't match <code>04:00</code> for example.

This may work better:

<pre><code>^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$
</code></pre>

blocks|key|4206556|text|您可以使用以下正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4206557|%5E[0-2]?[0-3]:[0-5][0-9]$|code-block|syntax|javascript|4206558|我所做的唯一修改是最左边的数字是可选的。正则表达式的其余部分是相同的。|4206559|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can use following regex :

<pre><code>^[0-2]?[0-3]:[0-5][0-9]$
</code></pre>

Only modification I have made is leftmost digit is optional. Rest of the regex is same.

blocks|key|2591515|text|以上这些对我来说都不起作用。最后，我使用了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2591516|%5E([0-1]?[0-9]%7C2[0-3]):[0-5][0-9]$+(js+engine)|code-block|syntax|javascript|2591517|逻辑：|offset|length|style|BOLD|2591518|第一个数字(小时)是:0到19之间的数字-->+[0-1]?[0-9]+(允许个位数)|CODE|2591519|或|2591520|20+-+23+-->+2[0-3]之间的数字|2591521|第二个数字(分钟)始终是00到59之间的数字-->+[0-5][0-9]+(不允许一个数字)|2591522|entityMap^0|0|0|0|3|0|O|B|0|0|C|6|0|Q|A|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@$I|10|J|11|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|12|8|@$I|13|J|14|K|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|15|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|16|8|@$I|17|J|18|K|O]]|9|@]|A|$]]|$1|T|3|U|5|6|7|19|8|@$I|1A|J|1B|K|O]]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|W|$]]

None of the above worked for me.
In the end I used:

<pre><code>^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$ (js engine)
</code></pre>

Logic:

The first number (hours) is either:
 a number between 0 and 19 --> <code>[0-1]?[0-9]</code> (allowing single digit number) 
 or 
 a number between 20 - 23 --> <code>2[0-3]</code>

the second number (minutes) is always a number between 00 and 59 --> <code>[0-5][0-9]</code> (not allowing a single digit)

blocks|key|4206628|text|我的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4206629|%5E(1?[0-9]%7C2[0-3]):[0-5][0-9]$|offset|length|style|CODE|4206630|这要短得多|4206631|通过几个示例进行了测试|4206632|匹配：|4206633|4206634|00:00|unordered-list-item|4206635|7:43|4206636|07:43|4206637|19:00|4206638|18:23|4206639|4206640|并且不匹配任何无效的实例，如25:76等...|4206641|entityMap^0|0|0|T|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@$D|16|E|17|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|18|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|19|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1A|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1C|8|@]|9|@]|A|$]]|$1|R|3|S|5|Q|7|1D|8|@]|9|@]|A|$]]|$1|T|3|U|5|Q|7|1E|8|@]|9|@]|A|$]]|$1|V|3|W|5|Q|7|1F|8|@]|9|@]|A|$]]|$1|X|3|Y|5|Q|7|1G|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1I|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|13|$]]

Mine is:

<code>^(1?[0-9]|2[0-3]):[0-5][0-9]$</code>

This is much shorter 

Got it tested with several example

Match:

<ul>
<li>00:00</li>
<li>7:43</li>
<li>07:43</li>
<li>19:00</li>
<li>18:23</li>
</ul>

And doesn't match any invalid instance such as 25:76 etc ...

blocks|key|4206679|text|令人惊讶的是，我发现实际上所有这些都不能完全覆盖它，因为它们不适用于0:0的较短格式午夜，其中一些也不适用于00:00，我使用并测试了以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4206680|%5E([0-9]%7C0[0-9]%7C1?[0-9]%7C2[0-3]):[0-5]?[0-9]$|code-block|syntax|javascript|4206681|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|$]]

Amazingly I found actually all of these don't quite cover it, as they don't work for shorter format midnight of 0:0 and a few don't work for 00:00 either, I used and tested the following:

<pre><code>^([0-9]|0[0-9]|1?[0-9]|2[0-3]):[0-5]?[0-9]$
</code></pre>

blocks|key|2591603|text|最好的选择是HH:MM，不用冒任何风险。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2591604|%5E(0[0-9]%7C1[0-9]%7C2[0-3]):[0-5][0-9]$|code-block|syntax|javascript|2591605|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|$]]

The best would be for HH:MM without taking any risk.

<pre><code>^(0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$
</code></pre>

blocks|key|2591640|text|检查我构建的这个masterfull+timestamp+detector正则表达式，以查找用户指定的时间戳，它将拾取的示例包括，但绝对不限于；|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2591641|8:30-9:40
09:40-09+:+50
09+:+40-09+:+50
09:40+-+09+:+50
08:00to05:00
08+:+00to05+:+00
08:00+to+05:00
8am-09pm
08h00+till+17h00
8pm-5am
08h00,21h00
06pm+untill+9am|code-block|syntax|javascript|2591642|它还会拾取更多，只要时间包括数字|2591643|entityMap|0|LINK|mutability|MUTABLE|url|http://regexr.com/395v5^0|8|T|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

check this <a href="http://regexr.com/395v5" rel="nofollow noreferrer">masterfull timestamp detector</a> regex I built to look for a user-specified timestamp, examples of what it will pickup include, but is most definitely NOT limited to;

<pre><code>8:30-9:40
09:40-09 : 50
09 : 40-09 : 50
09:40 - 09 : 50
08:00to05:00
08 : 00to05 : 00
08:00 to 05:00
8am-09pm
08h00 till 17h00
8pm-5am
08h00,21h00
06pm untill 9am
</code></pre>

It'll also pickup many more, as long as the times include digits

blocks|key|4491378|text|你可以使用这个24小时，秒数是可选的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491379|%5E([0-1]?[0-9]%7C[2][0-3]):([0-5][0-9])(:[0-5][0-9])?$|code-block|syntax|javascript|4491380|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 use this one 24H, seconds are optional

<pre><code>^([0-1]?[0-9]|[2][0-3]):([0-5][0-9])(:[0-5][0-9])?$
</code></pre>

blocks|key|526173|text|您可以使用以下正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|526174|%5E(2[0-3]%7C[01]?[0-9]):([1-5]{1}[0-9])$|code-block|syntax|javascript|526175|如果要排除00:00，可以使用以下表达式|526176|%5E(2[0-3]%7C[01]?[0-9]):(0[1-9]{1}%7C[1-5]{1}[0-9])$|526177|第二个表达式是更好的选择，因为有效时间是00:01到00:59或0:01到23:59。您可以根据需要使用这些工具中的任何一个。Regex101+link|offset|length|526178|entityMap|0|LINK|mutability|MUTABLE|url|http://regex101.com/r/mN1iT5/16^0|0|0|0|0|1R|D|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

You can use this regular expression:

<pre><code>^(2[0-3]|[01]?[0-9]):([1-5]{1}[0-9])$
</code></pre>

If you want to exclude 00:00, you can use this expression

<pre><code>^(2[0-3]|[01]?[0-9]):(0[1-9]{1}|[1-5]{1}[0-9])$
</code></pre>

Second expression is better option because valid time is 00:01 to 00:59 or 0:01 to 23:59. You can use any of these upon your requirement.
<a href="http://regex101.com/r/mN1iT5/16" rel="nofollow noreferrer">Regex101 link</a>

blocks|key|526187|text|您可以使用以下正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|526188|%5E[0-1][0-9]:[0-5][0-9]$%7C%5E[2][0-3]:[0-5][0-9]$%7C%5E[2][3]:[0][0]$|code-block|syntax|javascript|526189|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 use following regex: 

<pre><code>^[0-1][0-9]:[0-5][0-9]$|^[2][0-3]:[0-5][0-9]$|^[2][3]:[0][0]$
</code></pre>

blocks|key|4491469|text|您可以尝试执行以下操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491470|%5E\d{1,2}([:.]?\d{1,2})?([+]?[a%7Cp]m)?$|code-block|syntax|javascript|4491471|它可以检测以下模式：|4491472|2300+
23:00+
4+am+
4am+
4pm+
4+pm
04:30pm+
04:30+pm+
4:30pm+
4:30+pm
04.30pm
04.30+pm
4.30pm
4.30+pm
23:59+
0000+
00:00|4491473|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can try the following

<pre><code>^\d{1,2}([:.]?\d{1,2})?([ ]?[a|p]m)?$
</code></pre>

It can detect the following patterns : 

<pre><code>2300 
23:00 
4 am 
4am 
4pm 
4 pm
04:30pm 
04:30 pm 
4:30pm 
4:30 pm
04.30pm
04.30 pm
4.30pm
4.30 pm
23:59 
0000 
00:00
</code></pre>

blocks|key|2591785|text|下面的正则表达式将有助于验证hh:mm格式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2591786|%5E([0-1][0-9]%7C2[0-3]):[0-5][0-9]$|code-block|syntax|javascript|2591787|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|$]]

The below regex will help to validate hh:mm format

<pre><code>^([0-1][0-9]|2[0-3]):[0-5][0-9]$
</code></pre>

blocks|key|4206916|text|声明|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4206917|private+static+final+String+TIME24HOURS_PATTERN+=+"([01]?[0-9]%7C2[0-3]):[0-5][0-9]:[0-5][0-9]";

public+boolean+validate(final+String+time)+{
++++pattern+=+Pattern.compile(TIME24HOURS_PATTERN);
++++matcher+=+pattern.matcher(time);
++++return+matcher.matches();
}|code-block|syntax|javascript|4206918|当字符串与正则表达式匹配时，此方法返回"true“。|4206919|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Declare

<pre><code>private static final String TIME24HOURS_PATTERN = "([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]";

public boolean validate(final String time) {
 pattern = Pattern.compile(TIME24HOURS_PATTERN);
 matcher = pattern.matcher(time);
 return matcher.matches();
}
</code></pre>

This method return "true" when String match with the Regular Expression.

blocks|key|2591864|text|正如你问的最左边的可选部分，我也做了最左边和最右边的可选部分，看看它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2591865|%5E([0-9]%7C0[0-9]%7C1[0-9]%7C2[0-3]):[0-5][0-9]?$|code-block|syntax|javascript|2591866|它与|2591867|0:0+
00:00
00:0+
0:00
23:59
01:00
00:59|2591868|实况链接可通过here获得|offset|length|2591869|entityMap|0|LINK|mutability|MUTABLE|url|https://regex101.com/r/QVbb8w/1/^0|0|0|0|0|7|4|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

As you asked the left most bit optional, I have done left most and right most bit optional too, check it out 

<pre><code>^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]?$
</code></pre>

It matches with

<pre><code>0:0 
00:00
00:0 
0:00
23:59
01:00
00:59
</code></pre>

The live link is available <a href="https://regex101.com/r/QVbb8w/1/" rel="nofollow noreferrer">here</a>

blocks|key|4207036|text|对凌晨4点以上的Manish+M+Demblani's贡献稍作修改(我去掉了seconds部分，因为我的应用程序中不需要它)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4207037|%5E(([0-1]{0,1}[0-9](+)?(AM%7Cam%7CaM%7CAm%7CPM%7Cpm%7CpM%7CPm))%7C(([0]?[1-9]%7C1[0-2])(:%7C\.)[0-5][0-9](+)?(AM%7Cam%7CaM%7CAm%7CPM%7Cpm%7CpM%7CPm))%7C(([0]?[0-9]%7C1[0-9]%7C2[0-3])(:%7C\.)[0-5][0-9]))$|code-block|syntax|javascript|4207038|处理时间:+4:00+-+4:00+-4:00-4:00+pm+-4:30等。|4207039|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/29921396/2657515^0|8|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

A slight modification to <a href="https://stackoverflow.com/a/29921396/2657515">Manish M Demblani's</a> contribution above
handles 4am 
(I got rid of the seconds section as I don't need it in my application)

<pre><code>^(([0-1]{0,1}[0-9]( )?(AM|am|aM|Am|PM|pm|pM|Pm))|(([0]?[1-9]|1[0-2])(:|\.)[0-5][0-9]( )?(AM|am|aM|Am|PM|pm|pM|Pm))|(([0]?[0-9]|1[0-9]|2[0-3])(:|\.)[0-5][0-9]))$
</code></pre>

handles:
4am
4 am
4:00
4:00am
4:00 pm
4.30 am
 etc..

blocks|key|2592028|text|时间的正则表达式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2592029|2592030|HH:MM+12小时制，可选前导0|unordered-list-item|offset|length|style|BOLD|2592031|2592032|/%5E(0?1-9%7C10-2):0-5$/|2592033|2592034|HH:MM+12小时制，可选前导0，必选子午线(AM/PM)|2592035|2592036|/((10-2%7C0?1-9):(0-5)+?(AaPp))/|2592037|具有领先0的|2592038|HH:MM+24小时|2592039|2592040|/%5E(00-9%7C10-9%7C20-3):0-5$/|2592041|2592042|HH:MM+24小时制，可选前导0|2592043|2592044|/%5E(0-9%7C00-9%7C10-9%7C20-3):0-5$/|2592045|前导为0的|2592046|HH:MM:SS+24小时格式|2592047|2592048|/(?:01\d%7C20-3):(?:0-5\d):(?:0-5\d)/|2592049|2592050|entityMap^0|0|0|0|H|0|0|0|0|0|U|0|0|0|0|0|A|0|0|0|O|0|0|0|H|0|0|0|S|0|0|4|0|0|F|0|0|0|Z|0|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1H|8|@$F|1I|G|1J|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1L|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|1N|8|@$F|1O|G|1P|H|I]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1R|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1S|8|@]|9|@]|A|$]]|$1|U|3|V|5|E|7|1T|8|@$F|1U|G|1V|H|I]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1X|8|@$F|1Y|G|1Z|H|I]]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|20|8|@]|9|@]|A|$]]|$1|10|3|11|5|E|7|21|8|@$F|22|G|23|H|I]]|9|@]|A|$]]|$1|12|3|-4|5|6|7|24|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|25|8|@$F|26|G|27|H|I]]|9|@]|A|$]]|$1|15|3|16|5|6|7|28|8|@$F|29|G|2A|H|I]]|9|@]|A|$]]|$1|17|3|18|5|E|7|2B|8|@$F|2C|G|2D|H|I]]|9|@]|A|$]]|$1|19|3|-4|5|6|7|2E|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|6|7|2F|8|@$F|2G|G|2H|H|I]]|9|@]|A|$]]|$1|1C|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]|$1|1D|3|-4|5|6|7|2J|8|@]|9|@]|A|$]]]|1E|$]]

<h3 id="regular-expressions-for-time-n1ci">Regular Expressions for Time</h3>
<ul>
<li>HH:MM 12-hour format, optional leading 0
<pre><code> /^(0?[1-9]|1[0-2]):[0-5][0-9]$/
</code></pre>
</li>
<li>HH:MM 12-hour format, optional leading 0, mandatory meridiems (AM/PM)
<pre><code> /((1[0-2]|0?[1-9]):([0-5][0-9]) ?([AaPp][Mm]))/
</code></pre>
</li>
<li>HH:MM 24-hour with leading 0
<pre><code> /^(0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$/
</code></pre>
</li>
<li>HH:MM 24-hour format, optional leading 0
<pre><code> /^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$/
</code></pre>
</li>
<li>HH:MM:SS 24-hour format with leading 0
<pre><code> /(?:[01]\d|2[0-3]):(?:[0-5]\d):(?:[0-5]\d)/
</code></pre>
</li>
</ul>
<a href="https://digitalfortress.tech/tips/top-15-commonly-used-regex/" rel="noreferrer">Reference and Demo</a>

blocks|key|4491760|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491761|你的代码将不能正常工作，因为它不能工作于01:00类型格式。您可以按如下方式进行修改。|blockquote|4491762|4491763|4491764|pattern+=r"%5E(0?[1-9]%7C1[0-2]):[0-5][0-9]$"|code-block|syntax|javascript|4491765|我们可以使用一个变量来定义我们的|4491766|，我们可以添加子午线来获得更准确的结果。|4491767|4491768|4491769|hours_limit+=+12+
pattern+=+r"%5E[1-hours_limit]:[0-5][0-9]\s?[AaPp][Mm]$"
print(re.search(pattern,+"2:59+pm"))|4491770|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|U|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|V|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|W|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|X|7|@]|8|@]|9|$]]|$1|F|3|G|4|H|6|Y|7|@]|8|@]|9|$I|J]]|$1|K|3|L|4|5|6|Z|7|@]|8|@]|9|$]]|$1|M|3|N|4|C|6|10|7|@]|8|@]|9|$]]|$1|O|3|-4|4|5|6|11|7|@]|8|@]|9|$]]|$1|P|3|-4|4|5|6|12|7|@]|8|@]|9|$]]|$1|Q|3|R|4|H|6|13|7|@]|8|@]|9|$I|J]]|$1|S|3|-4|4|5|6|14|7|@]|8|@]|9|$]]]|T|$]]

<blockquote>
Your code will not work properly as it will not work for 01:00 type formats. You can modify it as follows.
</blockquote>
<pre><code>pattern =r&quot;^(0?[1-9]|1[0-2]):[0-5][0-9]$&quot;
</code></pre>
<blockquote>
Making it less complicated we can use a variable to define our hours limits.Further we can add meridiems for more accurate results.
</blockquote>
<pre><code>hours_limit = 12 
pattern = r&quot;^[1-hours_limit]:[0-5][0-9]\s?[AaPp][Mm]$&quot;
print(re.search(pattern, &quot;2:59 pm&quot;))
</code></pre>

blocks|key|4491821|text|上面的答案对我都不起作用，下面的答案起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491822|"[0-9]{2}:[0-9]{2}"|code-block|syntax|javascript|4491823|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|$]]

None of the above answers worked for me, the following one worked.
<pre><code>&quot;[0-9]{2}:[0-9]{2}&quot;
</code></pre>

blocks|key|4207328|text|要验证24小时时间，请使用以下命令：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4207329|%5E([0-1]?[0-9]%7C2?[0-3]%7C[0-9])[:\-\/]([0-5][0-9]%7C[0-9])$|code-block|syntax|javascript|4207330|这是接受的：|4207331|22:10
2:10
2/1
...|4207332|但不接受：|4207333|25:12
12:61
...|4207334|entityMap^0|3|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|10|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|T|$]]

To validate 24h time, use:
<pre><code>^([0-1]?[0-9]|2?[0-3]|[0-9])[:\-\/]([0-5][0-9]|[0-9])$
</code></pre>
This accepts:
<pre><code>22:10
2:10
2/1
...
</code></pre>
But does not accept:
<pre><code>25:12
12:61
...
</code></pre>

blocks|key|4491904|text|描述|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491905|hours:minutes具有以下特性：|offset|length|style|CODE|4491906|从AM%7CPM|4491907|Mandatory到5:1|unordered-list-item|4491908|
|4491909|Hours的|4491910|强制am%7Cpm或05:01前导为零01不接受00，因为在从00到59|4491911|的过程中|4491912|4491913|01:16+am✅|4491914|01:16+AM✅|4491915|01:16❌(未命中am%7Cpm)|4491916|01:16+Am❌(am必须全部为小写或大写)|4491917|1:16+am❌(缺少前导零的小时数)|4491918|00:16小时值(无效的小时值00)❌|4491919|正则表达式|4491920|要匹配单次出现，请执行以下操作：|4491921|%5E(0[1-9]%7C1[0-2]):([0-5][0-9])+((a%7Cp)m%7C(A%7CP)M)$|4491922|要匹配多个匹配项：|4491923|删除%5E+$|4491924|(0[1-9]%7C1[0-2]):([0-5][0-9])+((a%7Cp)m%7C(A%7CP)M)|4491925|entityMap^0|0|0|D|0|1|5|0|A|3|0|0|0|2|5|8|5|H|2|M|2|T|2|W|2|0|0|0|0|8|0|0|8|0|0|5|A|5|0|0|8|A|2|0|0|7|0|0|5|F|2|0|0|0|0|1A|0|0|2|1|4|1|0|0|18|0^^$0|@$1|2|3|4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1M|8|@$D|1N|E|1O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1P|8|@$D|1Q|E|1R|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|1S|8|@$D|1T|E|1U|F|G]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1V|8|@]|9|@]|A|$]]|$1|O|3|P|5|L|7|1W|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1X|8|@$D|1Y|E|1Z|F|G]|$D|20|E|21|F|G]|$D|22|E|23|F|G]|$D|24|E|25|F|G]|$D|26|E|27|F|G]|$D|28|E|29|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|2A|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|2B|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|2C|8|@$D|2D|E|2E|F|G]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|2F|8|@$D|2G|E|2H|F|G]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|2I|8|@$D|2J|E|2K|F|G]|$D|2L|E|2M|F|G]]|9|@]|A|$]]|$1|11|3|12|5|6|7|2N|8|@$D|2O|E|2P|F|G]|$D|2Q|E|2R|F|G]]|9|@]|A|$]]|$1|13|3|14|5|6|7|2S|8|@$D|2T|E|2U|F|G]]|9|@]|A|$]]|$1|15|3|16|5|6|7|2V|8|@$D|2W|E|2X|F|G]|$D|2Y|E|2Z|F|G]]|9|@]|A|$]]|$1|17|3|18|5|6|7|30|8|@]|9|@]|A|$]]|$1|19|3|1A|5|6|7|31|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|32|8|@$D|33|E|34|F|G]]|9|@]|A|$]]|$1|1D|3|1E|5|6|7|35|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|6|7|36|8|@$D|37|E|38|F|G]|$D|39|E|3A|F|G]]|9|@]|A|$]]|$1|1H|3|1I|5|6|7|3B|8|@$D|3C|E|3D|F|G]]|9|@]|A|$]]|$1|1J|3|-4|5|6|7|3E|8|@]|9|@]|A|$]]]|1K|$]]

<h2>Description</h2>
<code>hours:minutes</code> with:
<ul>
<li>Mandatory <code>am|pm</code> or <code>AM|PM</code></li>
<li>Mandatory leading zero <code>05:01</code> instead of <code>5:1</code></li>
<li>Hours from <code>01</code> up to <code>12</code></li>
<li>Hours does not accept <code>00</code> as in <code>00:16 am</code></li>
<li>Minutes from <code>00</code> up to <code>59</code></li>
</ul>
<code>01:16 am</code> ✅ 
<code>01:16 AM</code> ✅ 
<code>01:16</code> ❌ (misses <code>am|pm</code>) 
<code>01:16 Am</code>❌ (<code>am</code> must all be either lower or upper case) 
<code>1:16 am</code> ❌ (Hours misses leading zero) 
<code>00:16</code> ❌ (Invalid hours value <code>00</code>)
<h2>Regular Expression</h2>
To match single occurrence: 
<code>^(0[1-9]|1[0-2]):([0-5][0-9]) ((a|p)m|(A|P)M)$</code>
To match multiple occurrences: 
Remove <code>^</code> <code>$</code> 
<code>(0[1-9]|1[0-2]):([0-5][0-9]) ((a|p)m|(A|P)M)</code>

I want a regexp for matching time in HH:MM format. Here's what I have, and it works:

<pre><code>^[0-2][0-3]:[0-5][0-9]$
</code></pre>

This matches everything from 00:00 to 23:59.

However, I want to change it so 0:00 and 1:00, etc are also matched as well as 00:00 and 01:30. I.e to make the leftmost digit optional, to match HH:MM as well as H:MM.

Any ideas how to make that change? I need this to work in javascript as well as php.

Regular expression for matching HH:MM time format

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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我想要一个匹配HH:MM格式的时间的regexp。这就是我所拥有的，并且它是有效的：^[0-2][0-3]:[0-5][0-9]$从00:00到23:59都匹配。但是，我想更改它，以便0:00和1:00等也匹配00:00和01:30。即使最左边的数字可选，以匹配HH:MM和H:MM。有什么想法可以改变这一点吗？我需要这...

问匹配HH:MM时间格式的正则表达式
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问匹配HH:MM时间格式的正则表达式EN