regexp for python list

Question

I have a list of git branches in Python.

['fb_fix', 'master', 'rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0', 'rel.97.0']

I need a regular expression via re module, which will include all the list items where there is prefix rel. and any numbers by masks 00.0 or 00.0.0 or 000.0 or 000.0.0, i.e. exclude other values from the list, in my example this is 'fb_fix' and 'master':

['rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0', 'rel.97.0']

import subprocess

git_branches = subprocess.run("git branch -r", shell=True, stdout=subprocess.PIPE, encoding='utf-8')
branches_str = git_branches.stdout.replace("origin/", "")

branches_list = branches_str.split()
print(branches_list)

Tim Biegeleisen · Accepted Answer · 2021-03-23 15:25:19Z

1

Use a list comprehension:

inp = ['fb_fix', 'master', 'rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0', 'rel.97.0']
output = [x for x in inp if re.search(r'^rel\.\d+(?:\.\d+){1,2}', x)]
print(output)

This prints:

['rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0',
 'rel.97.0']

Edit:

Assuming that the value rel is in some string variable, then we can try dynamically building the regex pattern here:

prefix = 'rel'
regex = r'^' + prefix + r'\.\d+(?:\.\d+){1,2}'
inp = ['fb_fix', 'master', 'rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0', 'rel.97.0']
output = [x for x in inp if re.search(regex, x)]
print(output)  # same output as above

edited Mar 23, 2021 at 15:25

answered Mar 23, 2021 at 14:48

Tim Biegeleisen

526k32 gold badges323 silver badges399 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Denis Mozhaev Over a year ago

Hi Tim. Thank you for your quick answer. Can I do prefix rel like variable?

Tim Biegeleisen Over a year ago

Are you saying that you have some variable with the value 'rel' and you want to build the regex pattern dynamically?

Denis Mozhaev Over a year ago

Absolutely right. I tried to re.search(r"^\\{}\.\d+(?:\.\d+){1,2}".format(prefix), branch) Perhaps I need to escape characters

Tim Biegeleisen Over a year ago

@DenisMozhaev Check the updated answer above.

Denis Mozhaev Over a year ago

Thanks Tim. prefix = "rel" regex = r"^" + prefix + r"\.\d+(?:\.\d+){1,2}" b = [branch for branch in branches_list if re.search(regex, branch)]

|

torraodocerrado · Accepted Answer · 2021-03-23 14:48:54Z

0

You can use the lambda:

filtered = filter(lambda k: 'rel' in k, branches_list)

answered Mar 23, 2021 at 14:48

torraodocerrado

1

Comments

Yoel Nisanov · Accepted Answer · 2021-03-23 14:49:17Z

0

Hey you can make use of the filter function plus re.compile just like so-

import re

git_branches = ['fb_fix', 'master', 'rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0', 'rel.97.0']

r = re.compile('^(rel.*)')
my_branches = filter(r.match, git_branches)
print(list(my_branches))

the output of the code about is this ->

>>> ['rel.100.0', 'rel.101.0', 'rel.96.0', 'rel.96.2', 'rel.96.2.0', 'rel.97.0']

answered Mar 23, 2021 at 14:49

Yoel Nisanov

1,05410 silver badges17 bronze badges

Collectives™ on Stack Overflow

regexp for python list

3 Answers 3

6 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

6 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related