Extracting date from a string in Python

Question

How can I extract the date from a string like  monkey 2010-07-10 love banana   Thanks

User · Answer

If you know the position of the date object in the string (for example in a log file), you can use .split()[index] to extract the date without fully knowing the format.

For example:

>>> string = 'monkey 2010-07-10 love banana'
>>> date = string.split()[1]
>>> date
'2010-07-10'

User · Answer

Using Pygrok  you can define abstracted extensions to the Regular Expression syntax   The custom patterns can be included in your regex in the format   PATTERN NAME      You can also create a label for that pattern  by separating with a colon   s PATTERN NAME matched string   If the pattern matches  the value will be returned as part of the resulting dictionary  e g  result get  matched string     For example   from pygrok import Grok  input string    monkey 2010-07-10 love banana  date pattern      YEAR year -  MONTHNUM month -  MONTHDAY day    grok   Grok date pattern  print grok match input string     The resulting value will be a dictionary     month    07    day    10    year    2010    If the date pattern does not exist in the input string  the return value will be None  By contrast  if your pattern does not have any labels  it will return an empty dictionary     References    pygrok  Github  pygrok Preinstalled Definitions  Github

User · Answer

For extracting the date from a string in Python  the best module available is the datefinder module   You can use it in your Python project by following the easy steps given below   Step 1  Install datefinder Package  pip install datefinder   Step 2  Use It In Your Project  import datefinder  input string    monkey 2010-07-10 love banana    a generator will be returned by the datefinder module  I m typecasting it to a list  Please read the note of caution provided at the bottom  matches   list datefinder find dates input string    if len matches   gt  0        date returned will be a datetime datetime object  here we are only using the first match      date   matches 0      print date else      print  No dates found    note  if you are expecting a large number of matches  then typecasting to list won t be a recommended way as it will be having a big performance overhead

User · Answer

You could also try the dateparser module  which may be slower than datefinder on free text but which should cover more potential cases and date formats  as well as a significant number of languages

User · Answer

If the date is given in a fixed form  you can simply use a regular expression to extract the date and  datetime datetime strptime  to parse the date   import re from datetime import datetime  match   re search r  d 4 - d 2 - d 2    text  date   datetime strptime match group      Y- m- d   date     Otherwise  if the date is given in an arbitrary form  you can t extract it easily

User · Answer

Using python-dateutil   In  1   import dateutil parser as dparser  In  18   dparser parse  monkey 2010-07-10 love banana  fuzzy True  Out 18   datetime datetime 2010  7  10  0  0    Invalid dates raise a ValueError   In  19   dparser parse  monkey 2010-07-32 love banana  fuzzy True    ValueError  day is out of range for month   It can recognize dates in many formats   In  20   dparser parse  monkey 20 01 1980 love banana  fuzzy True  Out 20   datetime datetime 1980  1  20  0  0    Note that it makes a guess if the date is ambiguous   In  23   dparser parse  monkey 10 01 1980 love banana  fuzzy True  Out 23   datetime datetime 1980  10  1  0  0    But the way it parses ambiguous dates is customizable   In  21   dparser parse  monkey 10 01 1980 love banana  fuzzy True  dayfirst True  Out 21   datetime datetime 1980  1  10  0  0

[python] Extracting date from a string in Python

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