What is the regex pattern for datetime 2008-09-01 12 35 45

Question

What is the RegEx pattern for DateTime  2008-09-01 12 35 45      I get this error      No ending delimiter     found   Using   preg match    n      d     lt day gt 31     0  2469  11   30    0 2  29    0 2      3 4  1 6-9   2-9  d  0 48   2468  048   13579  26    16  2468  048   3579  26  00   0  1-9  1 d 2 0-8     lt sep gt    -     lt month gt 0  1-9  1 012   2   lt year gt  1 6-9   2-9  d  d 2         x20 d  x20        lt time gt   0  1-9  1 012     0-5  d  0 2   i    AP M     01  d 2 0-3     0-5  d  1 2         2008-09-01 12 35 45      Gives this error       Warning  preg match    function preg-match   Compilation failed  nothing to repeat at offset 0 in E  www index php on line 19

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Adding to  Greg Hewgill answer  if you want to be able to match both date-time and only date  you can make the  time  part of the regex optional     d 4  -  d 2  -  d 2      d 2     d 2     d 2       this way you will match both 2008-09-01 12 35 42 and 2008-09-01

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Here is my solution      2 0-9  3  - 0 1-9  1 012  - 0 1-9   12  0-9  3 01    0 0-9  1 0-9  2 0123      012345  0-9      012345  0-9    u

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I have modified the regex pattern from http   regexlib com REDetails aspx regexp id 610  The following pattern should match your case        d       1 6-9   2-9  d   d d  -        1 012  0  1-9   1   31   lt      0 2469  11      30 29    lt   02  29    0 2          1 6-9   2-9  d     0 48   2468  048   13579  26         16  2468  048   3579  26  00       x20        2 0-8  1 d 0  1-9          x20 d  x20        0  1-9  1 012     0-5  d  0 2   x20 AP M     01  d 2 0-3     0-5  d  1 2       YYYY-MM-DD HH MM SS

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date    2014-04-01 12 00 00    preg match     d 4  -  d 2  -  d 2     d 2     d 2     d 2      date   matches    print r  matches      matches will be   Array        0    gt  2014-04-01 12 00 00      1    gt  2014      2    gt  04      3    gt  01      4    gt  12      5    gt  00      6    gt  00     An easy way to break up a datetime formated string

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regarding to Imran answer from Sep  1th 2008 at 12 33 there is a missing   in the pattern the correct patterns are  preg match    d 4 - d 2 - d 2   d 2   d 2   d 2      2008-09-01 12 35 45    m1   print r   m1    preg match    d 4 - d 2 - d 2   d 1 2   d 2   d 2      2008-09-01 12 35 45    m2   print r   m2    preg match     d 4 - d 2 - d 2   d 2   d 2   d 2       2008-09-01 12 35 45    m3   print r   m3      this returns  Array    0    gt  2008-09-01 12 35 45   Array    0    gt  2008-09-01 12 35 45   Array    0    gt  2008-09-01 12 35 45

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Espo  I just have to say that regex is incredible  I d hate to have to write the code that did something useful with the matches  such as if you wanted to actually find out what date and time the user typed   It seems like Tom s solution would be more tenable  as it is about a zillion times simpler and with the addition of some parentheses you can easily get at the values the user typed     d 4  -  d 2  -  d 2     d 2     d 2     d 2     If you re using perl  then you can get the values out with something like this    year    1   month    2   day    3   hour    4   minute    5   second    6    Other languages will have a similar capability  Note that you will need to make some minor mods to the regex if you want to accept values such as single-digit months

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A simple version that will work for the format mentioned  but not all the others as per  Espos     d 4 - d 2 - d 2   d 2   d 2   d 2

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PHP preg functions needs your regex to be wrapped with a delimiter character  which can be any character  You can t use this delimiter character without escaping inside the regex  This should work  here the delimiter character is      preg match    d 4 - d 2 - d 2   d 2   d 2   d 2      2008-09-01 12 35 45        or this  to allow matching 0 00 00 time too  preg match    d 4 - d 2 - d 2   d 1 2   d 2   d 2      2008-09-01 12 35 45      If you need to match lines that contain only datetime  add   and   at the beginning and end of the regex   preg match     d 4 - d 2 - d 2   d 2   d 2   d 2       2008-09-01 12 35 45      Link to PHP Manual s preg match

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Here is a simplified version  originated from Espo s answer   It checks the correctness of date  even leap year   and  hh mm ss is optional  Examples that work  - 31 12 2003 11 59 59 - 29-2-2004       d       31       0  2469  11      30 29     0 2  29    0 2          1 6-9   2-9  d     0 48   2468  048   13579  26         16  2468  048   3579  26  00       x20        2 0-8  1 d 0  1-9     -       1 012  0  1-9   1   1 6-9   2-9  d   d d       x20 d  x20        01  d 2 0-3     0-5  d  1 2

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Here is my solution    12  d 3 - 0 1-9  1 0-2  - 0 1-9   12  d 3 01     01  0-9  2 0-3    0-5  d     Debuggex Demo  https   regex101 com r lbthaT 4

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2  0  d 2     0  d  1  0-2      0-2  d  3  0-1        2  0  d 2     0  d  1  0-2      0-2  d  3  0-1   s  0-1  d  2  0-3     0-5  d   0-5  d

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http   regexlib com REDetails aspx regexp id 610          d       31       0  2469  11      30 29     0 2  29    0 2          1 6-9   2-9  d     0 48   2468  048   13579  26         16  2468  048   3579  26  00       x20        2 0-8  1 d 0  1-9     -       1 012  0  1-9   1   1 6-9   2-9  d   d d       x20 d  x20        0  1-9  1 012     0-5  d  0 2   x20 AP M     01  d 2 0-3     0-5  d  1 2            This RE validates both dates and or   times patterns  Days in Feb  are also   validated for Leap years  Dates  in   dd mm yyyy or d m yy format between   1 1 1600 - 31 12 9999  Leading zeroes   are optional  Date separators can be   either matching dashes -   slashes      or periods    Times  in the hh MM ss   AM PM 12 hour format  12 00 AM -   11 59 59 PM  or hh MM ss military time   format  00 00 00 - 23 59 59   The 12   hour time format  1  may have a   leading zero for the hour  2  Minutes   and seconds are optional for the 12   hour format 3  AM or PM is required   and case sensitive  Military time 1    must have a leading zero for all hours   less than 10  2  Minutes are   manditory  3  seconds are optional    Datetimes  combination of the above   formats  A date first then a time   separated by a space  ex  dd mm yyyy   hh MM ss     Edit  Make sure you copy the RegEx from the regexlib com website as StackOverflow sometimes removes destroys special chars

[php] What is the regex pattern for datetime (2008-09-01 12:35:45 )?

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