


How to Escape the Pipe Delimiter in String.split() for Regex Ambiguity Resolution?
Escaping the Pipe Delimiter in String.split() for Regex Ambiguity Resolution
When parsing pipe-delimited data, the need to escape the pipe character in the String.split() method arises due to its double role as a regex operator. In this context, the pipe ('|') character signifies an 'or' operation, creating ambiguity with its intended use as a delimiter.
To clarify the interpretation, escaping the pipe character with a backslash ('') informs the split() method to treat it as a literal symbol representing the pipe delimiter itself. This prevents misunderstandings with regex operators and ensures the expected splitting behavior.
Here's a practical demonstration:
<code class="java">private ArrayList<string> parseLine(String line) { ArrayList<string> list = new ArrayList(); String[] list_str = line.split("\|"); // note the escape "\" here for (String s : list_str) { list.add(s); } return list; }</string></string></code>
By escaping the pipe character, the split() method interprets it correctly as a delimiter, dividing the input line into its individual components.
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