Now cregex "appears" to be included (for backward compatibility)

regtest/basic/rt-cregex-backward-compatibility/Makefile

@@ -0,0 +1 @@
+include ../../scripts/test.make

regtest/basic/rt-cregex-backward-compatibility/config

@@ -0,0 +1,3 @@
+type=plumed
+#this just tests that config will always return cregex as existing, for backward compatibility
+arg="config has cregex"

regtest/basic/rt-cregex-backward-compatibility/out.reference

@@ -0,0 +1 @@
+cregex on

regtest/isdb/rt-Metainference-averaging/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-jcoupling-string-type/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainference-mc-chunksize/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainference-optisigmamean-sem-max/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainference-optisigmamean-sem/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainference-regres-zero/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainferencebase-averaging/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainferencebase-regres-zero/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

regtest/isdb/rt-metainferencebase-sem-max/config

@@ -1,4 +1,3 @@
-plumed_needs="cregex"
 type=driver
 # this is to test a different name
 arg="--plumed plumed.dat --trajectory-stride 2 --timestep 0.002 --mf_xtc trajectory.xtc --dump-forces atom_forces --dump-forces-fmt=%7.3f"

src/config/Config.h

@@ -99,7 +99,8 @@ bool hasDlopen();
 
 bool isInstalled();
 
-bool hasCregex();
+/// This will always return true for backward compatibility
+constexpr bool hasCregex() {return true;}
 
 bool hasMolfile();
 

src/config/Config.inc.in

@@ -155,14 +155,6 @@ bool hasDlopen() {
 #endif
 }
 
-bool hasCregex() {
-#ifdef __PLUMED_HAS_CREGEX
-  return true;
-#else
-  return false;
-#endif
-}
-
 bool hasMolfile() {
 #ifdef __PLUMED_HAS_MOLFILE_PLUGINS
   return true;

src/maketools/update-config-txt.sh

@@ -132,6 +132,8 @@ echo "# if option xx is on then plumed has beeen compiled with -D__PLUMED_HAS_XX
       echo "has $u off"
     fi
   done
+  #this is here for backward compatibility (since we are using c++17 that has <regex>)
+  echo "has cregex on"
 } | sort
 echo
 echo "# other defines"