Extract a part of a string and append it to a tag - python-3.x

Question

I want to find a string that starts with "section_" and add this as a value to a tag in the same line.
Example: Following is the input in a file of type ditamap.
<topicref href="xyz/debug_logging_in_xyz-section_i_y_mn.dita"/>
<topicref href="xyz/workflows_id-section_exf_zaz_lo.dita"/>
<topicref href="xyz/images_id-section_ekl_bbz_lo.dita"/>
Desired output:
<topicref href="xyz/debug_logging_in_xyz-section_i_y_mn.dita" keys="section_i_y_mn"/>
<topicref href="xyz/workflows_id-section_exf_zaz_lo.dita" keys="section_exf_zaz_lo"/>
<topicref href="xyz/images_id-section_ekl_bbz_lo.dita" keys="section_ekl_bbz_lo"/>
I understand BeautifulSoup can be used to achieve this. But, I am new and do not know the syntax. Can anyone help?
Here is the code I am trying to use:
import os
from bs4 import BeautifulSoup as bs
globpath = "C:/DATA" #add your directory path here
def main(path):
with open(path, encoding="utf-8") as f:
s = f.read()
s = bs(s, "xml")
imgs = s.find_all("topicref")
for i in imgs:
if "section" in i["href"]:
i["keys"] = i["href"].replace("*-","").replace(".dita*","")
s = str(s)
with open(path, "w", encoding="utf-8") as f:
f.write(s)
for dirpath, directories, files in os.walk(globpath):
for fname in files:
if fname.endswith(".ditamap"):
path = os.path.join(dirpath, fname)
main(path)
But, it's adding the entire path in the keys attribute. I need only the portion that starts with section and ends before .dita.
Regex worked:Here is the final code
from bs4 import BeautifulSoup as bs
import re
globpath = "C:/DATA" #add your directory path here
def main(path):
with open(path, encoding="utf-8") as f:
s = f.read()
s = bs(s, "xml")
imgs = s.find_all("topicref")
for i in imgs:
if "section" in i["href"]:
try:
i["keys"] = re.findall("section[^\.]*",i["href"])[0]
except:
print("Could not replace")
s = str(s)
with open(path, "w", encoding="utf-8") as f:
f.write(s)```

Answer 1

I think it should be done with Regex (cuz thats the most i can do)
from bs4 import BeautifulSoup
import re
soup = BeautifulSoup('your-string-input-of-tags-goes-here', 'html.parser')
soup.find_all('topicref', {'keys': re.compile(r'(section_([^ "])+)')})
Returns a list of matched tags
Check this code whether it works or not