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When I use regular expressions in helm occur for narrowing, it does not show line previews

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Is this normal functioning? If so, are there any workarounds?

Update:

I found out that the error only occurs when I use white characters in a set.

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    Most likely a bug, getting the same for M-x helm-do-grep and a pattern including \( (which is pretty useful when searching Lisp code). Please open a ticket. – wasamasa Feb 22 '16 at 21:54
  • Thank you @wasamasa I wrote an issue to Helm's github. I assume this is the same thing like open a ticket. – atevm Feb 23 '16 at 13:20
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Thanks to thierryvolpiatto from Helm's github, I learnt the answer. Helm interprets spaces as search pattern separators so they should be escaped with backslashes.

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