Locate substring (index, rindex)
- index
- rindex
text = "The black cat climbed the green tree"
puts text.index("cat")
puts text.index("dog")
puts text.index("c")
puts text.rindex("c")
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text = "The black cat climbed the green tree"
puts text.index("cat")
puts text.index("dog")
puts text.index("c")
puts text.rindex("c")