Regex Tester & Validator

Matches zero or more digits that appear immediately after the letter 'c' and before either a closing brace '}' or the end of a line. This is useful for extracting numeric identifiers, version numbers, or codes from structured text where a 'c' prefix indicates the start and '}' or a newline acts as a delimiter, such as parsing category labels or configuration entries. The pattern uses lookbehind and lookahead to ensure the digits are correctly positioned without consuming surrounding characters.