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  1. regex = /(?<![^[:space:]])2([[:space:].)])/
  2. text_content = "\n2 hel2 lo"
  3. puts text_content.index(regex)
Success #stdin #stdout 0s 28688KB
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https://ideone.com/vwVGtA
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
public

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