What Are Regular Expressions?
Regular expressions describe a pattern. They locate or validate specific strings or patterns of text.
Regular expressions use various tools to write patterns, like the following.
Assertions: Special characters that remove ambiguity or partial matching from an expression. Characters: Caret (^) and dollar sign ($)
Groups/Ranges: Used for matching characters.
Characters: Square brackets [ ] or parentheses ( )
Quantifiers: Defines the number of times a character, pattern, or group appears in a match. Characters: Question mark (?), asterisk (*), and plus sign (+)
Metacharacters: Shorthand characters that replace longer expressions.
Characters: \d, \s, and \w
Escaping: Match a literal character that could be interpreted as a special character.
Character: \
Example Expressions:
^[a-z]$
\s[a-zA-Z]\d+\s
^Ashle(igh|[ey])?$
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