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, 16 insertions, 0 deletions

diff --git a/src/corelib/tools/qregularexpression.cpp b/src/corelib/tools/qregularexpression.cpp
index 1bd06a73cd..6f0e572f41 100644
--- a/src/corelib/tools/qregularexpression.cpp
+++ b/src/corelib/tools/qregularexpression.cpp
@@ -483,6 +483,11 @@ QT_BEGIN_NAMESPACE
     Note the usage of the non-capturing group in order to preserve the meaning
     of the branch operator inside the pattern.
 
+    The QRegularExpression::anchoredPattern() helper method does exactly that for
+    you.
+
+    \sa anchoredPattern
+
     \section3 Porting from QRegExp's Partial Matching
 
     When using QRegExp::exactMatch(), if an exact match was not found, one
@@ -1995,6 +2000,17 @@ QString QRegularExpression::wildcardToRegularExpression(const QString &pattern)
 }
 
 /*!
+    \fn QRegularExpression::anchoredPattern(const QString &expression)
+
+    \since 5.12
+
+    Returns the expression wrapped between the \c{\A} and \c{\z} anchors to be
+    used for exact matching.
+
+    \sa {Porting from QRegExp's Exact Matching}
+*/
+
+/*!
     \since 5.1
 
     Constructs a valid, empty QRegularExpressionMatch object. The regular