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Note that these regular expressions give all of the following
symbols (operator characters) a special meaning:
\ " . ^ $ [] * + ? {} | /
Their special meaning must be turned off if they are needed to represent themselves in a character string. We can do so by quoting the character within a string of length one or more; e.g., the regular expression "**" matches the string **. We can also get the literal meaning of an operator character by preceding it by a backslash. Thus, the regular expression \*\* also matches the string **. Write a regular expression that matches the string "\.
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