Error
Error Code:
3698
MySQL Error 3698: Regex Backtrack Stack Overflow
Description
MySQL Error 3698, 'Overflow in the regular expression backtrack stack', indicates that a regular expression operation has exceeded the memory allocated for its internal processing stack. This typically occurs when complex or inefficient regex patterns are applied to long input strings, leading to excessive recursion and state tracking during the matching process.
Error Message
Overflow in the regular expression backtrack stack.
Known Causes
3 known causesOverly Complex Regular Expressions
Patterns with deep nesting, many alternations, or repeated quantifiers can trigger excessive backtracking during evaluation, consuming stack resources rapidly.
Matching Against Long Input Strings
Even moderately complex regexes can exhaust the backtrack stack when applied to very lengthy input strings, as the engine needs to track numerous states.
Catastrophic Backtracking
Certain regex patterns exhibit exponential time complexity, causing the engine to explore an enormous number of possibilities and quickly overflow the stack.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service