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Python での正規表現の使用法の例

Python では、 re モジュールを使うことで、正規表現が利用可能である。

簡単な例

以下に、簡単な re モジュールの利用例を示す。

#!/usr/pkg/bin/python3.9

# importing regular expression module
import re

# string
string = 'Mon Jan 25 13:25:59 CST 2021'

# making a regular expression pattern
pattern = re.compile ('(\d{2}):(\d{2}):(\d{2})')

# pattern matching
match = re.search (pattern, string)

# printing result
print ("original string =", string)
if (match):
    hour   = int (match.group (1))
    minute = int (match.group (2))
    second = int (match.group (3))
    print ("HH:MM:SS = %02d:%02d:%02d" % (hour, minute, second) )

実際に、実行してみると、以下のようになる。
% ./test_re_0.py
original string = Mon Jan 25 13:25:59 CST 2021
HH:MM:SS = 13:25:59

別の例

もう一つの別の例は以下の通り。

#!/usr/pkg/bin/python3.9

# importing regular expression module
import re

# string
string = 'Mon Jan 25 13:25:59 CST 2021'

# making a regular expression pattern
pattern = re.compile ('^(\S+)\s+(\S+)\s+(\S+)\s+(\d+:\d+:\d+)\s+(\S+)\s+(\d+)$')

# pattern matching
match = re.search (pattern, string)

# printing result
print ("original string =", string)
if (match):
    dayofweek = match.group (1)
    month     = match.group (2)
    day       = int (match.group (3))
    hhmmss    = match.group (4)
    timezone  = match.group (5)
    year      = int (match.group (6))
    print ("%s %02d/%s/%04d (%s)" % (hhmmss, day, month, year, timezone) )

実行すると以下のようになる。
% ./test_re_1.py
original string = Mon Jan 25 13:25:59 CST 2021
13:25:59 25/Jan/2021 (CST)

参考文献



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