Article title grep backend replacement

SQL

/*
A backend replacement for https://tools.wmflabs.org/grep/ 
The current implementation of grep is very slow.
But as I've discovered by experimenting with this query,
"REGEXP" is not paricularly fast on its own either.
"LIKE" is much faster for some reason.
*/
SET @regex_pattern = "^U\+";
SET @like_pattern = "C+%";

USE enwiki_p; /* "Language" and "Project" */
SELECT *
FROM page
WHERE 
  page_namespace = 0 /* Namespace */
  /* AND page_title REGEXP @regex_pattern /* "Pattern" */
  AND page_title LIKE @like_pattern /* More straightforward option for pattern-based searching */  
  /* AND NOT page_is_redirect - negate "Include redirects" */
/* LIMIT 100 /* "Limit the display to the first 100 results" */
SQL

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