Fixing catastrophic backtracki…

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Catastrophic backtracking in regex is a common problem. There is an email regex I see especially often at StackOveflow, and it is fraught with this issue. Learn how optional patterns inside quantified groups can lead to catastrophic backtracking and how to solve this easily.

REGEX FIDDLE:

FURTHER LINKS

– Runaway Regular Expressions: Catastrophic Backtracking:
– Regex pattern matching takes a long time for strings with length more than 30 chars:

– Why this code stuck node.js – Bug on Javascript?:
– Why does python’s re.search method hang?:
– Very slow Regular Expression in Java:
– Catastrophic backtracking issue with large string using regular expression:

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