fetch: precompile proxy extraction regex

Move regex pattern compilation to module load time
for better performance in repeated calls.

fetch.py

@@ -12,11 +12,16 @@ def set_config(cfg):
     global config
     config = cfg
 
+# Pre-compiled regex patterns (compiled once at module load)
 cleanhtml_re = [
     re.compile('<.*?>'),
     re.compile('\s+'),
     re.compile('::+'),
 ]
+
+# Proxy extraction pattern: IP:PORT followed by non-digit or end
+# Pattern: 1-3 digits, dot, repeated 3 times, colon, 2-5 digit port
+PROXY_PATTERN = re.compile(r'([0-9]+(?:\.[0-9]+){3}:[0-9]{2,5})[\D$]')
 def cleanhtml(raw_html):
     html = raw_html.replace('&nbsp;', ' ')
     html = re.sub(cleanhtml_re[0], ':', html)
@@ -233,7 +238,7 @@ def extract_proxies(content, proxydb=None, filter_known=True, proto=None):
             new_proxies is list of (address, proto) tuples
         If not filter_known: list of (address, proto) tuples
     """
-    matches = re.findall(r'([0-9]+(?:\.[0-9]+){3}:[0-9]{2,5})[\D$]', cleanhtml(content))
+    matches = PROXY_PATTERN.findall(cleanhtml(content))
 
     uniques_dict = {}
     for p in matches: