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wrap global flags like ((?i)xxx) or (?:(?i)xxx) to local flags (?i:xxx) if supported by RE-engine in the python version

pull/3267/head
sebres 2022-06-21 16:56:57 +02:00
parent 7e2ab36d86
commit 4337e36616
1 changed files with 10 additions and 0 deletions
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10
fail2ban/server/failregex.py
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@ -91,6 +91,13 @@ R_MAP = {
"PORT": "fport",
}
# map global flags like ((?i)xxx) or (?:(?i)xxx) to local flags (?i:xxx) if supported by RE-engine in this python version:
try:
re.search("^re(?i:val)$", "reVAL")
R_GLOB2LOCFLAGS = ( re.compile(r"(?<!\\)\((?:\?:)?(\(\?[a-z]+)\)"), r"\1:" )
except:
R_GLOB2LOCFLAGS = ()
def mapTag2Opt(tag):
try: # if should be mapped:
return R_MAP[tag]
@ -124,6 +131,9 @@ class Regex:
#
if regex.lstrip() == '':
raise RegexException("Cannot add empty regex")
# special handling wrapping global flags to local flags:
if R_GLOB2LOCFLAGS:
regex = R_GLOB2LOCFLAGS[0].sub(R_GLOB2LOCFLAGS[1], regex)
try:
self._regexObj = re.compile(regex, re.MULTILINE if multiline else 0)
self._regex = regex