Regular expression for matching HH MM time format

Question

I want a regexp for matching time in HH MM format  Here s what I have  and it works     0-2  0-3   0-5  0-9     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

User · Answer

You can try the following    d 1 2        d 1 2         a p m      It can detect the following patterns     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

User · Answer

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      0-9  0 0-9  1  0-9  2 0-3    0-5   0-9

User · Answer

Declare  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        This method return  true  when String match with the Regular Expression

User · Answer

Your original regular expression has flaws  it wouldn t match 04 00 for example   This may work better      0-1   0-9  2 0-3    0-5  0-9

User · Answer

As you asked the left most bit optional  I have done left most and right most bit optional too  check it out      0-9  0 0-9  1 0-9  2 0-3    0-5  0-9      It matches with  0 0  00 00 00 0  0 00 23 59 01 00 00 59   The live link is available here

User · Answer

Mine is     1  0-9  2 0-3    0-5  0-9    This is much shorter   Got it tested with several example  Match    00 00 7 43 07 43 19 00 18 23   And doesn t match any invalid instance such as 25 76 etc

User · Answer

You can use following regex        0-1  0-9   0-5  0-9     2  0-3   0-5  0-9     2  3   0  0

User · Answer

check this masterfull timestamp detector regex I built to look for a user-specified timestamp  examples of what it will pickup include  but is most definitely NOT limited to   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   It ll also pickup many more  as long as the times include digits

User · Answer

The below regex will help to validate hh mm format     0-1  0-9  2 0-3    0-5  0-9

User · Answer

Your code will not work properly as it will not work for 01 00 type formats  You can modify it as follows   pattern  r quot   0  1-9  1 0-2    0-5  0-9   quot    Making it less complicated we can use a variable to define our hours limits Further we can add meridiems for more accurate results   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

User · Answer

Matches    2 9 2 09 2 59 02 9 02 09 02 59 23 59   Use it       0-9  0 0-9  1 0-9  2 0-3     0-9   0-5  0-9

User · Answer

You can use this regular expression     2 0-3   01   0-9     1-5  1  0-9      If you want to exclude 00 00  you can use this expression    2 0-3   01   0-9    0 1-9  1   1-5  1  0-9      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  Regex101 link

User · Answer

You can use this one 24H  seconds are optional     0-1   0-9   2  0-3     0-5  0-9     0-5  0-9

User · Answer

None of the above worked for me  In the end I used      0-1   0-9  2 0-3    0-5  0-9    js engine    Logic   The first number  hours  is either   a number between 0 and 19 --   0-1   0-9   allowing single digit number   or  a number between 20 - 23 --  2 0-3   the second number  minutes  is always a number between 00 and 59 --   0-5  0-9   not allowing a single digit

User · Answer

You can use following regex      0-2   0-3   0-5  0-9     Only modification I have made is leftmost digit is optional  Rest of the regex is same

User · Answer

The best would be for HH MM without taking any risk     0 0-9  1 0-9  2 0-3    0-5  0-9

User · Answer

Regular Expressions for Time  HH MM 12-hour format  optional leading 0      0  1-9  1 0-2    0-5  0-9      HH MM 12-hour format  optional leading 0  mandatory meridiems  AM PM       1 0-2  0  1-9     0-5  0-9      AaPp  Mm       HH MM 24-hour with leading 0     0 0-9  1 0-9  2 0-3    0-5  0-9      HH MM 24-hour format  optional leading 0      0-9  0 0-9  1 0-9  2 0-3    0-5  0-9      HH MM SS 24-hour format with leading 0       01  d 2 0-3       0-5  d      0-5  d      Reference and Demo

User · Answer

Try the following     0-2  0-3   0-5  0-9    0  0-9   0-5  0-9      Note  I was assuming the javascript regex engine   If it s different than that please let me know

User · Answer

A slight modification to Manish M Demblani s contribution above handles  4am   I got rid of the seconds section as I don t need it in my application       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       handles  4am 4 am 4 00 4 00am 4 00 pm 4 30 am  etc

[regex] Regular expression for matching HH:MM time format

Examples related to regex