Using libpcre instead of c++11 regex

build/pcre.m4

@@ -0,0 +1,91 @@
+dnl Check for PCRE Libraries
+dnl CHECK_PCRE(ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
+dnl Sets:
+dnl  PCRE_CFLAGS
+dnl  PCRE_LIBS
+
+PCRE_CONFIG=""
+PCRE_VERSION=""
+PCRE_CPPFLAGS=""
+PCRE_CFLAGS=""
+PCRE_LDFLAGS=""
+PCRE_LDADD=""
+PCRE_LD_PATH=""
+
+AC_DEFUN([CHECK_PCRE],
+[dnl
+
+AC_ARG_WITH(
+    pcre,
+    [AC_HELP_STRING([--with-pcre=PATH],[Path to pcre prefix or config script])],
+    [test_paths="${with_pcre}"],
+    [test_paths="/usr/local/libpcre /usr/local/pcre /usr/local /opt/libpcre /opt/pcre /opt /usr"])
+
+AC_MSG_CHECKING([for libpcre config script])
+
+dnl # Determine pcre lib directory
+if test -z "${with_pcre}"; then
+    test_paths="/usr/local/pcre /usr/local /usr"
+else
+    test_paths="${with_pcre}"
+fi
+
+for x in ${test_paths}; do
+    dnl # Determine if the script was specified and use it directly
+    if test ! -d "$x" -a -e "$x"; then
+        PCRE_CONFIG=$x
+        pcre_path="no"
+        break
+    fi
+
+    dnl # Try known config script names/locations
+    for PCRE_CONFIG in pcre-config; do
+        if test -e "${x}/bin/${PCRE_CONFIG}"; then
+            pcre_path="${x}/bin"
+            break
+        elif test -e "${x}/${PCRE_CONFIG}"; then
+            pcre_path="${x}"
+            break
+        else
+            pcre_path=""
+        fi
+    done
+    if test -n "$pcre_path"; then
+        break
+    fi
+done
+
+if test -n "${pcre_path}"; then
+    if test "${pcre_path}" != "no"; then
+        PCRE_CONFIG="${pcre_path}/${PCRE_CONFIG}"
+    fi
+    AC_MSG_RESULT([${PCRE_CONFIG}])
+    PCRE_VERSION="`${PCRE_CONFIG} --version`"
+    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(pcre VERSION: $PCRE_VERSION); fi
+    PCRE_CFLAGS="`${PCRE_CONFIG} --cflags`"
+    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(pcre CFLAGS: $PCRE_CFLAGS); fi
+    PCRE_LDADD="`${PCRE_CONFIG} --libs`"
+    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(pcre LDADD: $PCRE_LDADD); fi
+    PCRE_LD_PATH="/`${PCRE_CONFIG} --libs | cut -d'/' -f2,3,4,5,6 | cut -d ' ' -f1`"
+    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(pcre PCRE_LD_PATH: $PCRE_LD_PATH); fi
+else
+    AC_MSG_RESULT([no])
+fi
+
+AC_SUBST(PCRE_CONFIG)
+AC_SUBST(PCRE_VERSION)
+AC_SUBST(PCRE_CPPFLAGS)
+AC_SUBST(PCRE_CFLAGS)
+AC_SUBST(PCRE_LDFLAGS)
+AC_SUBST(PCRE_LDADD)
+AC_SUBST(PCRE_LD_PATH)
+
+if test -z "${PCRE_VERSION}"; then
+    AC_MSG_NOTICE([*** pcre library not found.])
+    ifelse([$2], , AC_MSG_ERROR([pcre library is required]), $2)
+else
+    AC_MSG_NOTICE([using pcre v${PCRE_VERSION}])
+    ifelse([$1], , , $1) 
+    PCRE_LDADD="${PCRE_LDADD} -lpcrecpp"
+fi 
+])