Node:Simple Characters,
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Simple Characters
In regular expressions, generally, a character matches itself. The only
exceptions are regular expression special characters. To match one of
these special characters, you must put a \ before the character.
For example, the regular expression abc matches a set of strings
that contain abc somewhere in them. Since * happens to be
a regular expression special character, the regular expression \*
matches any string that contains the * character.
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