From 42748d0d6d230fc62c4b912a8f276731fabc820d Mon Sep 17 00:00:00 2001
From: Yaron Koren <yaron57@gmail.com>
Date: Thu, 3 May 2018 14:52:06 +0000
Subject: [PATCH] Disable regex option for SQLite

Change-Id: I83c8b38a47fc571077fef1fccabb31f5db0ac2e5
(cherry picked from commit d7db166e4f8c579f5979cc25e1bf04682633f3fd)
---
 src/SpecialReplaceText.php | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/SpecialReplaceText.php b/src/SpecialReplaceText.php
index 202bbe80..b502f7df 100644
--- a/src/SpecialReplaceText.php
+++ b/src/SpecialReplaceText.php
@@ -423,17 +423,23 @@ class SpecialReplaceText extends SpecialPage {
 			Xml::textarea( 'replacement', $this->replacement, 100, 5, [ 'style' => 'width: auto;' ] )
 		);
 		$out->addHTML( '</td></tr></table>' );
-		$out->addHTML( Xml::tags( 'p', null,
-				Xml::checkLabel(
-					$this->msg( 'replacetext_useregex' )->text(),
-					'use_regex', 'use_regex'
+
+		// SQLite unfortunately lacks a REGEXP function or operator by
+		// default, so disable regex(p) searches for SQLite.
+		$dbr = wfGetDB( DB_REPLICA );
+		if ( ! $dbr instanceof Wikimedia\Rdbms\DatabaseSqlite ) {
+			$out->addHTML( Xml::tags( 'p', null,
+					Xml::checkLabel(
+						$this->msg( 'replacetext_useregex' )->text(),
+						'use_regex', 'use_regex'
+					)
+				) . "\n" .
+				Xml::element( 'p',
+					[ 'style' => 'font-style: italic' ],
+					$this->msg( 'replacetext_regexdocu' )->text()
 				)
-			) . "\n" .
-			Xml::element( 'p',
-				[ 'style' => 'font-style: italic' ],
-				$this->msg( 'replacetext_regexdocu' )->text()
-			)
-		);
+			);
+		}
 
 		// The interface is heavily based on the one in Special:Search.
 		$namespaces = SearchEngine::searchableNamespaces();