GeezerVisonThe World Wide Web, restored to 800 pixels of glory. |
| Home|About|Gaming cabinet|Archives|How it works|Starter sites |
GeezerVison is showing github.com — python_reference/reg_expr_2_operators.py at master · jeffreywugz/python_reference Expand file tree/ Copy pathreg_expr_2_operators.pyMore file actions 127 lines (105 loc) · 3.13 KB / Copy pathreg_expr_2_operators.pyFile metadata and controls127 lines (105 loc) · 3.13 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 # Examples for using Python's Regular expression module "re" # sr 11/30/2013 import re '''OVERVIEW '*' matches all characters that follow (0 or more) '+' matches all characters that follow (1 or more) '?' makes the previous character optional '{4}' previous character must match exactly 4 times '{2-4}' previous character must match exactly 2-4 times '[0-9]' matches all characters in the set of numbers 0 to 9 '[A-Z]' matches all characters in the set of A to Z '\d' matches all digits, e.g., '4', '9' ... '\D' matches all NON-digit characters '\s' matches all space characters: '', '\t', '\r', '\n' '\S' matches all NON-space characters '\w' matches all non-punctuation characters (i.e., letters and digits) '\W' matches all NON-letter and NON-digit characters '^bla' NOT-matches 'bla' 'let$' matches 'let' but not 'letter' '\b' matches transition between non-word characters and word characters ''' data = '''2013-01-01 2012-02-02 aaaa-02-02 aa-02-02 -04-04 2000 02-02 ghi stu 2012-03-03'''.strip().split('\n') # A >> '*' matches all characters that follow (0 or more) print (50*'-' + '\nA\n' + 50*'-') for line in data: match = re.search('(.*)-(..)-(..)', line) # note the parantheses if match: print(match.group(1), match.group(2), match.group(3)) ''' -------------------------------------------------- A -------------------------------------------------- 2013 01 01 2012 02 02 aaaa 02 02 aa 02 02 04 04 2012 03 03 ''' # B >> '+' matches all characters that follow (1 or more) print (50*'-' + '\nB\n' + 50*'-') for line in data: match = re.search('(.+)-(..)-(..)', line) # note the parantheses if match: print(match.group(1), match.group(2), match.group(3)) ''' -------------------------------------------------- B -------------------------------------------------- 2013 01 01 2012 02 02 aaaa 02 02 aa 02 02 2012 03 03 ''' # C >> '?' makes the previous character optional print (50*'-' + '\nC\n' + 50*'-') for line in data: match = re.search('(.+)-?(..)-(..)', line) # note the parantheses if match: print(match.group(1), match.group(2), match.group(3)) ''' -------------------------------------------------- C -------------------------------------------------- 2013- 01 01 2012- 02 02 aaaa- 02 02 aa- 02 02 - 04 04 2000 02 02 2012- 03 03 ''' # D >> '{4}' previous character must match exactly 4 times print (50*'-' + '\nD\n' + 50*'-') for line in data: match = re.search('(a{4})-(..)-(..)', line) # note the parantheses if match: print(match.group(1), match.group(2), match.group(3)) ''' -------------------------------------------------- D -------------------------------------------------- aaaa 02 02 ''' # E >>'{2-4}' previous character must match exactly 2-4 times print (50*'-' + '\nE\n' + 50*'-') for line in data: match = re.search('(a{2,4})-(..)-(..)', line) # note the parantheses if match: print(match.group(1), match.group(2), match.group(3)) ''' -------------------------------------------------- E -------------------------------------------------- aaaa 02 02 aa 02 02 ''' |
| You are visitor 01402520 — GeezerVison does not store the pages you look up. Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required. |