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The operator ^ matches the left end of a line, and \$ matches the right end of a line. The operator ^ is also used to introduce complemented character classes, but the context always makes it clear which meaning is intended. For example, ^ [^aeiou]* \$ matches any complete line that does not contain a lowercase vowel.

  1. How do you tell which meaning of ^ is intended?
  2. Can you always replace a regular expression using the ^ and $ operators by an equivalent expression that does not use either of these operators?
in Compiler Design by Veteran (54.9k points) | 13 views

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