In a regular expression,
any character that is not a metacharacter has its normal literal
meaning. This includes the lowercase and uppercase alphabet and the digits,
plus some punctuation marks, such as the colon and the exclamation mark.
Many other punctuation characters and symbols are metacharacters and have a
For example, the regular expression
the letter `c', followed by the letter
`a', followed by the letter `t'.
sat on the mat.
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 New Zealand License.