I want to split a string with “?” as the delimiter.
str.split("?")[0] fails.
I want to split a string with ? as the delimiter. str.split(?)[0] fails.
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The argument to the “split” method must be a regular expression, and the ‘?’ character has special meaning in regular expressions so you have to escape it. That’s done by adding a backslash before it in the regexp. However, since the regexp is being supplied by way of a Java String, it requires two backslashes instead so as to get an actual backslash character into the regexp: