Use Ruby RegEx to identify phrase in sentence

I want to write a condition that evaluates to tru开发者_开发百科e if a string contains the phrase: "no row at position 0".

For example, let's assume the string is:

"Feed returned error status: There is no row at position 0."

---

You don't need a regular expression to look for a fixed substring, just include? will do:

"Feed returned error status: There is no row at position 0.".include?("no row at position 0")
# => true

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For this specific case, you don't need a regex. A simple index will do:

irb(main):001:0> a = "Feed returned error status: There is no row at position 0."
=> "Feed returned error status: There is no row at position 0."
irb(main):002:0> a.index("no row at position 0")
=> 37

index will return nil if it didn't find the string:

irb(main):003:0> a.index("no row at position 0a")
=> nil