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+Attempts to [match][17] the given `pattern`
+anywhere (at any [position][2]) in the [target substring][3].
+
+If the match attempt succeeds:
+
+- Sets [match values][9].
+- Sets the [byte position][2] to the end of the matched substring;
+  may adjust the [character position][7].
+- Returns the size of the matched substring.
+
+```rb
+scanner = StringScanner.new(HIRAGANA_TEXT)
+scanner.string           # => "こんにちは"
+scanner.pos = 6
+scanner.skip_until(/ち/) # => 6
+put_match_values(scanner)
+# Basic match values:
+#   matched?:       true
+#   matched_size:   3
+#   pre_match:      "こんに"
+#   matched  :      "ち"
+#   post_match:     "は"
+# Captured match values:
+#   size:           1
+#   captures:       []
+#   named_captures: {}
+#   values_at:      ["ち", nil]
+#   []:
+#     [0]:          "ち"
+#     [1]:          nil
+put_situation(scanner)
+# Situation:
+#   pos:       12
+#   charpos:   4
+#   rest:      "は"
+#   rest_size: 3
+```
+
+If the match attempt fails:
+
+- Clears match values.
+- Returns `nil`.
+- Does not update positions.
+
+```rb
+scanner.skip_until(/nope/)     # => nil
+match_values_cleared?(scanner) # => true
+```