[v6.x backport] cluster, dns, repl, tls, util: fix RegExp nits#14348

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vsemozhetbyt wants to merge 1 commit intonodejs:v6.x-stagingfrom vsemozhetbyt:backport-13536-to-v6.x

+17-13

Commits on Jul 18, 2017

cluster, dns, repl, tls, util: fix RegExp nits
vsemozhetbyt
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