Understanding the Dollar Sign ($) Symbol in MySQL REGEXP
In MySQL regular expressions, the dollar sign $ is an anchor that matches the end of a string. It ensures that the pattern preceding the $ occurs at the end of the string.
End Anchor:
pattern$matches strings that end with the specified pattern.Position-Specific Matching: Unlike simple substring matching,
$ensures the match occurs at the very end of the string.Combining with Character Classes: You can use it with brackets, e.g.,
[0-9]{4}$matches strings ending with four digits.Use in Validation: Useful for validating formats that must end in a specific way, such as file extensions, postal codes, or numeric codes.
When used in a SELECT query with REGEXP, $ helps narrow down matches to strings ending with specific characters or patterns.