Filename matching with regex in python
I'm looking for a regex command to map file names in a folder. I already have all the filenames in the list. Now I want to match the pattern in a loop (file matches a string):
./test1_word1_1.1_1.2_1.3.csv
from:
match = re.search(r'./{([\w]+)}_word1_{([0-9.]+)}_{([0-9.]+)}_{([0-9.]+)}*',file)
I used regex, but in this special case it just doesn't work. Can you help me?
I want to continue matching the regex like this (I wrote the result here):
match[0] = test1
match[1] = 1.1
match[2] = 1.2
match[3] = 1.3
The grieving brackets are my fault. They don't make any sense. excuse me
Regards, Sebastian
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3 answers
you can use
r'\./([^\W_]+)_word1_([0-9.]+)_([0-9.]+)_([0-9]+(?:\.[0-9]+)*)'
See regex demo
More details
-
\.
- literal dot (if not displayed, it matches any char other than a char string break) -
/
- character/
(don't need to be escaped in Python regex pattern) -
([^\W_]+)
- Group 1 matches 1 or more letters or numbers (if you want to match a piece containing_
, keep your original template(\w+)
) -
_word1_
- literal substring -
([0-9.]+)
- Group 1 matches 1 or more digits and / or.
symbols -
_
- underscore character -
([0-9.]+)
- Group 2 matches 1 or more digits and / or.
symbols -
_
- underscore character -
([0-9]+(?:\.[0-9]+)*)
- Group 3 corresponding to 1 or more digits followed by 0+ sequences.
and 1 or more digits
import re
rx = r"\./([^\W_]+)_word1_([0-9.]+)_([0-9.]+)_([0-9]+(?:\.[0-9]+)*)"
s = "./test1_word1_1.1_1.2_1.3.csv"
m = re.search(rx, s)
if m:
print("Part1: {}\nPart2: {}\nPart3: {}\nPart4: {}".format(m.group(1), m.group(2), m.group(3), m.group(4) ))
Output:
Part1: test1
Part2: 1.1
Part3: 1.2
Part4: 1.3
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Since test_word <>. csv is the filename and the contents inside <> will always change and contain dots and dots, can you try this?
r "test1_word [_0-9.] *. csv" r
Sample code and test lines
# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"test1_word[_0-9.]*.csv"
test_str = ("./test1_word1_1.1_1.2_1.3.csv\n"
"./test1_word1_1.31.2_1.555.csv\n"
"./test1_word1_10.31.2_2000.00.csv")
matches = re.finditer(regex, test_str)
for matchNum, match in enumerate(matches):
matchNum = matchNum + 1
print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
for groupNum in range(0, len(match.groups())):
groupNum = groupNum + 1
print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
Want to check it out? https://regex101.com/ will help you.
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