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#!/usr/bin/env python
"""
Copyright (c) 2006-2025 sqlmap developers (https://sqlmap.org)
See the file 'LICENSE' for copying permission
"""
import re
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.HIGHEST
def dependencies():
pass
def tamper(payload, **kwargs):
"""
Replaces an integer followed by UNION with an integer followed by e0UNION
Requirement:
* MySQL
* MsSQL
Notes:
* Reference: https://media.blackhat.com/us-13/US-13-Salgado-SQLi-Optimization-and-Obfuscation-Techniques-Slides.pdf
>>> tamper('1 UNION ALL SELECT')
'1e0UNION ALL SELECT'
"""
return re.sub(r"(?i)(\d+)\s+(UNION )", r"\g<1>e0\g<2>", payload) if payload else payload
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