Implement exact match expression builder for QRegularExpression

QRegularExpression doesn't offer a direct equivalent of QRegExp's exact
match.

There are several places in the Qt sources that use this feature. This
patch implements a small helper function that builds the expression as
recommended in the documentation and updates the related code.

[ChangeLog][Core][Tools] QRegularExpression now provides
anchoredPattern() which is a helper function to build regular
expressions used for exact matching.

Change-Id: Idbbf142c4c5cb9b62abf8229f4ce85fd4409e5d0
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/corelib/tools/qregularexpression.h b/src/corelib/tools/qregularexpression.h
index 388aa7a8ca..f9e7029550 100644
--- a/src/corelib/tools/qregularexpression.h
+++ b/src/corelib/tools/qregularexpression.h
@@ -142,6 +142,12 @@ public:
 
     static QString escape(const QString &str);
     static QString wildcardToRegularExpression(const QString &str);
+    static inline QString anchoredPattern(const QString &expression)
+    {
+        return QLatin1String("\\A(?:")
+               + expression
+               + QLatin1String(")\\z");
+    }
 
     bool operator==(const QRegularExpression &re) const;
     inline bool operator!=(const QRegularExpression &re) const { return !operator==(re); }