Numbers and Symbols
| (alternation) syntax, function of, 17–18
* (asterisk) character
for matching zero or more characters, 10–11
in regular expressions, 8
\ (backslash) character
as escape character, 9
in regular expressions, 8
[] (brackets)
for matching one of a group of characters, 13
in regular expressions, 8
^ (caret) character
denoting “the string starts with”, 37
in regular expressions, 8
\d{3} metacharacter, representation for phone numbers, 16
- (dash), replacing with _ (underscore) in a URI, 42
$ (dollar sign) character
denoting “the ...
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