What Are Regular Expressions?

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LiquidWeb
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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])?$

Read the full article: https://www.liquidweb.com/kb/what-are-regular-expressions/
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