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Fix case that input regexp matches empty string

emacs helm-swoop

searching for \| will go into an infinite loop · Issue #29 · ShingoFukuyama/helm-swoop · GitHub


Input regexp which matches empty string(zero width match) has
caused infinite loops and hungs up.


I fixed this issue. We can use more complex regexp like 'OR',
'word bound', 'symbol bound' etc and use helm-swoop more useful.


I can find such bug because I fixed such bugs in emacs-anzu. :)

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