ruby-grape / grape / 30169220365 / 12

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master: 97%

Pull #2815

github

Fix line-anchored regexes matching per line instead of whole string

Ruby's ^ and $ anchor to lines, not string boundaries, so two
whole-string checks misfired on multi-line input:

- Types::Json#parse used /^\s*$/ as its blank check, so any payload
  containing a blank line ("[1,2]\n\n", pretty-printed JSON with an
  empty line) was treated as blank and silently coerced to nil.
  Replaced with blank?, which anchors correctly and drops the regex.
- Router::Pattern::Path#valid_part? used /^\S/, accepting a part that
  starts with whitespace as long as a later line starts without it.
  Anchored with \A.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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