diff --git a/.github/workflows/dockerhub.yml b/.github/workflows/dockerhub.yml
index bd2c01aa..48c44429 100644
--- a/.github/workflows/dockerhub.yml
+++ b/.github/workflows/dockerhub.yml
@@ -28,9 +28,9 @@ jobs:
         id: step_one
         run: |
           if [ "$DOCKER_PASSWORD" ] ; then
-            echo "::set-output name=hasToken::true"
+            echo "hasToken=true" >>$GITHUB_OUTPUT
           else
-            echo "::set-output name=hasToken::false"
+            echo "hasToken=false" >>$GITHUB_OUTPUT
           fi
       - name: Check the value
         run: echo ${{ steps.step_one.outputs.hasToken }}
@@ -43,9 +43,9 @@ jobs:
       - name: checkout code
         uses: actions/checkout@v3
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
       - name: login to docker hub
         run: |
           echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
diff --git a/Dockerfile b/Dockerfile
index d9c243b8..2ad50e6a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -26,7 +26,7 @@ COPY ./ /install_acme.sh/
 RUN cd /install_acme.sh && ([ -f /install_acme.sh/acme.sh ] && /install_acme.sh/acme.sh --install || curl https://get.acme.sh | sh) && rm -rf /install_acme.sh/
 
 
-RUN ln -s  /root/.acme.sh/acme.sh  /usr/local/bin/acme.sh && crontab -l | grep acme.sh | sed 's#> /dev/null##' | crontab -
+RUN ln -s /root/.acme.sh/acme.sh /usr/local/bin/acme.sh && crontab -l | grep acme.sh | sed 's#> /dev/null#> /proc/1/fd/1 2>/proc/1/fd/2#' | crontab -
 
 RUN for verb in help \
   version \
diff --git a/acme.sh b/acme.sh
index 74a855f9..5d73cdb6 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1852,9 +1852,15 @@ _inithttp() {
       _ACME_CURL="$_ACME_CURL --cacert $CA_BUNDLE "
     fi
 
-    if _contains "$(curl --help 2>&1)" "--globoff"; then
+    if _contains "$(curl --help 2>&1)" "--globoff" || _contains "$(curl --help curl 2>&1)" "--globoff"; then
       _ACME_CURL="$_ACME_CURL -g "
     fi
+
+    #don't use --fail-with-body
+    ##from curl 7.76: return fail on HTTP errors but keep the body
+    #if _contains "$(curl --help http 2>&1)" "--fail-with-body"; then
+    #  _ACME_CURL="$_ACME_CURL --fail-with-body "
+    #fi
   fi
 
   if [ -z "$_ACME_WGET" ] && _exists "wget"; then
@@ -1872,11 +1878,11 @@ _inithttp() {
     elif [ "$CA_BUNDLE" ]; then
       _ACME_WGET="$_ACME_WGET --ca-certificate=$CA_BUNDLE "
     fi
-  fi
 
-  #from wget 1.14: do not skip body on 404 error
-  if [ "$_ACME_WGET" ] && _contains "$($_ACME_WGET --help 2>&1)" "--content-on-error"; then
-    _ACME_WGET="$_ACME_WGET --content-on-error "
+    #from wget 1.14: do not skip body on 404 error
+    if _contains "$(wget --help 2>&1)" "--content-on-error"; then
+      _ACME_WGET="$_ACME_WGET --content-on-error "
+    fi
   fi
 
   __HTTP_INITIALIZED=1
@@ -2223,6 +2229,16 @@ _send_signed_request() {
         _debug3 _body "$_body"
       fi
 
+      _retryafter=$(echo "$responseHeaders" | grep -i "^Retry-After *:" | cut -d : -f 2 | tr -d ' ' | tr -d '\r')
+      if [ "$code" = '503' ] || [ "$_retryafter" ]; then
+        _sleep_overload_retry_sec=$_retryafter
+        if [ -z "$_sleep_overload_retry_sec" ]; then
+          _sleep_overload_retry_sec=5
+        fi
+        _info "It seems the CA server is currently overloaded, let's wait and retry. Sleeping $_sleep_overload_retry_sec seconds."
+        _sleep $_sleep_overload_retry_sec
+        continue
+      fi
       if _contains "$_body" "JWS has invalid anti-replay nonce" || _contains "$_body" "JWS has an invalid anti-replay nonce"; then
         _info "It seems the CA server is busy now, let's wait and retry. Sleeping $_sleep_retry_sec seconds."
         _CACHED_NONCE=""
@@ -2857,7 +2873,7 @@ _initpath() {
 
     if _isEccKey "$_ilength"; then
       DOMAIN_PATH="$domainhomeecc"
-    else
+    elif [ -z "$__SELECTED_RSA_KEY" ]; then
       if [ ! -d "$domainhome" ] && [ -d "$domainhomeecc" ]; then
         _info "The domain '$domain' seems to have a ECC cert already, lets use ecc cert."
         DOMAIN_PATH="$domainhomeecc"
@@ -4018,7 +4034,7 @@ _ns_purge_cf() {
 
 #checks if cf server is available
 _ns_is_available_cf() {
-  if _get "https://cloudflare-dns.com" "" 1 >/dev/null 2>&1; then
+  if _get "https://cloudflare-dns.com" "" 10 >/dev/null; then
     return 0
   else
     return 1
@@ -4026,7 +4042,7 @@ _ns_is_available_cf() {
 }
 
 _ns_is_available_google() {
-  if _get "https://dns.google" "" 1 >/dev/null 2>&1; then
+  if _get "https://dns.google" "" 10 >/dev/null; then
     return 0
   else
     return 1
@@ -4042,7 +4058,7 @@ _ns_lookup_google() {
 }
 
 _ns_is_available_ali() {
-  if _get "https://dns.alidns.com" "" 1 >/dev/null 2>&1; then
+  if _get "https://dns.alidns.com" "" 10 >/dev/null; then
     return 0
   else
     return 1
@@ -4058,7 +4074,7 @@ _ns_lookup_ali() {
 }
 
 _ns_is_available_dp() {
-  if _get "https://doh.pub" "" 1 >/dev/null 2>&1; then
+  if _get "https://doh.pub" "" 10 >/dev/null; then
     return 0
   else
     return 1
@@ -7502,6 +7518,9 @@ _process() {
     --keylength | -k)
       _keylength="$2"
       shift
+      if [ "$_keylength" ] && ! _isEccKey "$_keylength"; then
+        export __SELECTED_RSA_KEY=1
+      fi
       ;;
     -ak | --accountkeylength)
       _accountkeylength="$2"
diff --git a/dnsapi/dns_huaweicloud.sh b/dnsapi/dns_huaweicloud.sh
index ceda9258..b61c1d43 100644
--- a/dnsapi/dns_huaweicloud.sh
+++ b/dnsapi/dns_huaweicloud.sh
@@ -23,7 +23,7 @@ dns_huaweicloud_add() {
 
   HUAWEICLOUD_Username="${HUAWEICLOUD_Username:-$(_readaccountconf_mutable HUAWEICLOUD_Username)}"
   HUAWEICLOUD_Password="${HUAWEICLOUD_Password:-$(_readaccountconf_mutable HUAWEICLOUD_Password)}"
-  HUAWEICLOUD_DomainName="${HUAWEICLOUD_DomainName:-$(_readaccountconf_mutable HUAWEICLOUD_Username)}"
+  HUAWEICLOUD_DomainName="${HUAWEICLOUD_DomainName:-$(_readaccountconf_mutable HUAWEICLOUD_DomainName)}"
 
   # Check information
   if [ -z "${HUAWEICLOUD_Username}" ] || [ -z "${HUAWEICLOUD_Password}" ] || [ -z "${HUAWEICLOUD_DomainName}" ]; then
@@ -74,7 +74,7 @@ dns_huaweicloud_rm() {
 
   HUAWEICLOUD_Username="${HUAWEICLOUD_Username:-$(_readaccountconf_mutable HUAWEICLOUD_Username)}"
   HUAWEICLOUD_Password="${HUAWEICLOUD_Password:-$(_readaccountconf_mutable HUAWEICLOUD_Password)}"
-  HUAWEICLOUD_DomainName="${HUAWEICLOUD_DomainName:-$(_readaccountconf_mutable HUAWEICLOUD_Username)}"
+  HUAWEICLOUD_DomainName="${HUAWEICLOUD_DomainName:-$(_readaccountconf_mutable HUAWEICLOUD_DomainName)}"
 
   # Check information
   if [ -z "${HUAWEICLOUD_Username}" ] || [ -z "${HUAWEICLOUD_Password}" ] || [ -z "${HUAWEICLOUD_DomainName}" ]; then
@@ -98,19 +98,59 @@ dns_huaweicloud_rm() {
   fi
   _debug "Zone ID is:" "${zoneid}"
 
+  record_id="$(_get_recordset_id "${token}" "${fulldomain}" "${zoneid}")"
+  _recursive_rm_record "${token}" "${fulldomain}" "${zoneid}" "${record_id}"
+  ret="$?"
+  if [ "${ret}" != "0" ]; then
+    _err "dns_api(dns_huaweicloud): Error removing record."
+    return 1
+  fi
+
+  return 0
+}
+
+###################  Private functions below ##################################
+
+# _recursive_rm_record
+# remove all records from the record set
+#
+# _token=$1
+# _domain=$2
+# _zoneid=$3
+# _record_id=$4
+#
+# Returns 0 on success
+_recursive_rm_record() {
+  _token=$1
+  _domain=$2
+  _zoneid=$3
+  _record_id=$4
+
+  # Most likely to have problems will huaweicloud side if more than 50 attempts but still cannot fully remove the record set
+  # Maybe can be removed manually in the dashboard
+  _retry_cnt=50
+
   # Remove all records
   # Therotically HuaweiCloud does not allow more than one record set
   # But remove them recurringly to increase robusty
-  while [ "${record_id}" != "0" ]; do
+
+  while [ "${_record_id}" != "0" ] && [ "${_retry_cnt}" != "0" ]; do
     _debug "Removing Record"
-    _rm_record "${token}" "${zoneid}" "${record_id}"
-    record_id="$(_get_recordset_id "${token}" "${fulldomain}" "${zoneid}")"
+    _retry_cnt=$((_retry_cnt - 1))
+    _rm_record "${_token}" "${_zoneid}" "${_record_id}"
+    _record_id="$(_get_recordset_id "${_token}" "${_domain}" "${_zoneid}")"
+    _debug2 "Checking record exists: record_id=${_record_id}"
   done
+
+  # Check if retry count is reached
+  if [ "${_retry_cnt}" = "0" ]; then
+    _debug "Failed to remove record after 50 attempts, please try removing it manually in the dashboard"
+    return 1
+  fi
+
   return 0
 }
 
-###################  Private functions below ##################################
-
 # _get_zoneid
 #
 # _token=$1
@@ -124,7 +164,7 @@ _get_zoneid() {
 
   i=1
   while true; do
-    h=$(printf "%s" "${_domain_string}" | cut -d . -f $i-100)
+    h=$(printf "%s" "${_domain_string}" | cut -d . -f "$i"-100)
     if [ -z "$h" ]; then
       #not valid
       return 1
@@ -135,11 +175,11 @@ _get_zoneid() {
     if _contains "${response}" '"id"'; then
       zoneidlist=$(echo "${response}" | _egrep_o "\"id\": *\"[^\"]*\"" | cut -d : -f 2 | tr -d \" | tr -d " ")
       zonenamelist=$(echo "${response}" | _egrep_o "\"name\": *\"[^\"]*\"" | cut -d : -f 2 | tr -d \" | tr -d " ")
-      _debug2 "Return Zone ID(s):" "${zoneidlist}"
-      _debug2 "Return Zone Name(s):" "${zonenamelist}"
+      _debug2 "Returned Zone ID(s):" "${zoneidlist}"
+      _debug2 "Returned Zone Name(s):" "${zonenamelist}"
       zoneidnum=0
       zoneidcount=$(echo "${zoneidlist}" | grep -c '^')
-      _debug "Retund Zone ID(s) Count:" "${zoneidcount}"
+      _debug "Returned Zone ID(s) Count:" "${zoneidcount}"
       while [ "${zoneidnum}" -lt "${zoneidcount}" ]; do
         zoneidnum=$(_math "$zoneidnum" + 1)
         _zoneid=$(echo "${zoneidlist}" | sed -n "${zoneidnum}p")
@@ -206,8 +246,7 @@ _add_record() {
       \"type\": \"TXT\",
       \"ttl\": 1,
       \"records\": [
-        ${_exist_record},
-        \"\\\"${_txtvalue}\\\"\"
+        ${_exist_record},\"\\\"${_txtvalue}\\\"\"
       ]
     }"
   fi
@@ -215,19 +254,16 @@ _add_record() {
   _record_id="$(_get_recordset_id "${_token}" "${_domain}" "${zoneid}")"
   _debug "Record Set ID is:" "${_record_id}"
 
-  # Remove all records
-  while [ "${_record_id}" != "0" ]; do
-    _debug "Removing Record"
-    _rm_record "${_token}" "${zoneid}" "${_record_id}"
-    _record_id="$(_get_recordset_id "${_token}" "${_domain}" "${zoneid}")"
-  done
-
   # Add brand new records with all old and new records
   export _H2="Content-Type: application/json"
   export _H1="X-Auth-Token: ${_token}"
 
   _debug2 "${_post_body}"
-  _post "${_post_body}" "${dns_api}/v2/zones/${zoneid}/recordsets" >/dev/null
+  if [ -z "${_exist_record}" ]; then
+    _post "${_post_body}" "${dns_api}/v2/zones/${zoneid}/recordsets" >/dev/null
+  else
+    _post "${_post_body}" "${dns_api}/v2/zones/${zoneid}/recordsets/${_record_id}" false "PUT" >/dev/null
+  fi
   _code="$(grep "^HTTP" "$HTTP_HEADER" | _tail_n 1 | cut -d " " -f 2 | tr -d "\\r\\n")"
   if [ "$_code" != "202" ]; then
     _err "dns_huaweicloud: http code ${_code}"
diff --git a/dnsapi/dns_ipv64.sh b/dnsapi/dns_ipv64.sh
new file mode 100755
index 00000000..54470119
--- /dev/null
+++ b/dnsapi/dns_ipv64.sh
@@ -0,0 +1,157 @@
+#!/usr/bin/env sh
+
+#Created by Roman Lumetsberger, to use ipv64.net's API to add/remove text records
+#2022/11/29
+
+# Pass credentials before "acme.sh --issue --dns dns_ipv64 ..."
+# --
+# export IPv64_Token="aaaaaaaaaaaaaaaaaaaaaaaaaa"
+# --
+#
+
+IPv64_API="https://ipv64.net/api"
+
+########  Public functions ######################
+
+#Usage: dns_ipv64_add _acme-challenge.domain.ipv64.net "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_ipv64_add() {
+  fulldomain=$1
+  txtvalue=$2
+
+  IPv64_Token="${IPv64_Token:-$(_readaccountconf_mutable IPv64_Token)}"
+  if [ -z "$IPv64_Token" ]; then
+    _err "You must export variable: IPv64_Token"
+    _err "The API Key for your IPv64 account is necessary."
+    _err "You can look it up in your IPv64 account."
+    return 1
+  fi
+
+  # Now save the credentials.
+  _saveaccountconf_mutable IPv64_Token "$IPv64_Token"
+
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain" "$fulldomain"
+    return 1
+  fi
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+
+  # convert to lower case
+  _domain="$(echo "$_domain" | _lower_case)"
+  _sub_domain="$(echo "$_sub_domain" | _lower_case)"
+  # Now add the TXT record
+  _info "Trying to add TXT record"
+  if _ipv64_rest "POST" "add_record=$_domain&praefix=$_sub_domain&type=TXT&content=$txtvalue"; then
+    _info "TXT record has been successfully added."
+    return 0
+  else
+    _err "Errors happened during adding the TXT record, response=$_response"
+    return 1
+  fi
+
+}
+
+#Usage: fulldomain txtvalue
+#Usage: dns_ipv64_rm _acme-challenge.domain.ipv64.net "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+#Remove the txt record after validation.
+dns_ipv64_rm() {
+  fulldomain=$1
+  txtvalue=$2
+
+  IPv64_Token="${IPv64_Token:-$(_readaccountconf_mutable IPv64_Token)}"
+  if [ -z "$IPv64_Token" ]; then
+    _err "You must export variable: IPv64_Token"
+    _err "The API Key for your IPv64 account is necessary."
+    _err "You can look it up in your IPv64 account."
+    return 1
+  fi
+
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain" "$fulldomain"
+    return 1
+  fi
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+
+  # convert to lower case
+  _domain="$(echo "$_domain" | _lower_case)"
+  _sub_domain="$(echo "$_sub_domain" | _lower_case)"
+  # Now delete the TXT record
+  _info "Trying to delete TXT record"
+  if _ipv64_rest "DELETE" "del_record=$_domain&praefix=$_sub_domain&type=TXT&content=$txtvalue"; then
+    _info "TXT record has been successfully deleted."
+    return 0
+  else
+    _err "Errors happened during deleting the TXT record, response=$_response"
+    return 1
+  fi
+
+}
+
+####################  Private functions below ##################################
+#_acme-challenge.www.domain.com
+#returns
+# _sub_domain=_acme-challenge.www
+# _domain=domain.com
+_get_root() {
+  domain="$1"
+  i=1
+  p=1
+
+  _ipv64_get "get_domains"
+  domain_data=$_response
+
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f "$i"-100)
+    if [ -z "$h" ]; then
+      #not valid
+      return 1
+    fi
+
+    #if _contains "$domain_data" "\""$h"\"\:"; then
+    if _contains "$domain_data" "\"""$h""\"\:"; then
+      _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-"$p")
+      _domain="$h"
+      return 0
+    fi
+    p=$i
+    i=$(_math "$i" + 1)
+  done
+  return 1
+}
+
+#send get request to api
+# $1 has to set the api-function
+_ipv64_get() {
+  url="$IPv64_API?$1"
+  export _H1="Authorization: Bearer $IPv64_Token"
+
+  _response=$(_get "$url")
+  _response="$(echo "$_response" | _normalizeJson)"
+
+  if _contains "$_response" "429 Too Many Requests"; then
+    _info "API throttled, sleeping to reset the limit"
+    _sleep 10
+    _response=$(_get "$url")
+    _response="$(echo "$_response" | _normalizeJson)"
+  fi
+}
+
+_ipv64_rest() {
+  url="$IPv64_API"
+  export _H1="Authorization: Bearer $IPv64_Token"
+  export _H2="Content-Type: application/x-www-form-urlencoded"
+  _response=$(_post "$2" "$url" "" "$1")
+
+  if _contains "$_response" "429 Too Many Requests"; then
+    _info "API throttled, sleeping to reset the limit"
+    _sleep 10
+    _response=$(_post "$2" "$url" "" "$1")
+  fi
+
+  if ! _contains "$_response" "\"info\":\"success\""; then
+    return 1
+  fi
+  _debug2 response "$_response"
+  return 0
+}
diff --git a/dnsapi/dns_nanelo.sh b/dnsapi/dns_nanelo.sh
new file mode 100644
index 00000000..8ccc8c29
--- /dev/null
+++ b/dnsapi/dns_nanelo.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env sh
+
+# Official DNS API for Nanelo.com
+
+# Provide the required API Key like this:
+# NANELO_TOKEN="FmD408PdqT1E269gUK57"
+
+NANELO_API="https://api.nanelo.com/v1/"
+
+########  Public functions #####################
+
+# Usage: add  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_nanelo_add() {
+  fulldomain=$1
+  txtvalue=$2
+
+  NANELO_TOKEN="${NANELO_TOKEN:-$(_readaccountconf_mutable NANELO_TOKEN)}"
+  if [ -z "$NANELO_TOKEN" ]; then
+    NANELO_TOKEN=""
+    _err "You didn't configure a Nanelo API Key yet."
+    _err "Please set NANELO_TOKEN and try again."
+    _err "Login to Nanelo.com and go to Settings > API Keys to get a Key"
+    return 1
+  fi
+  _saveaccountconf_mutable NANELO_TOKEN "$NANELO_TOKEN"
+
+  _info "Adding TXT record to ${fulldomain}"
+  response="$(_get "$NANELO_API$NANELO_TOKEN/dns/addrecord?type=TXT&ttl=60&name=${fulldomain}&value=${txtvalue}")"
+  if _contains "${response}" 'success'; then
+    return 0
+  fi
+  _err "Could not create resource record, please check the logs"
+  _err "${response}"
+  return 1
+}
+
+dns_nanelo_rm() {
+  fulldomain=$1
+  txtvalue=$2
+
+  NANELO_TOKEN="${NANELO_TOKEN:-$(_readaccountconf_mutable NANELO_TOKEN)}"
+  if [ -z "$NANELO_TOKEN" ]; then
+    NANELO_TOKEN=""
+    _err "You didn't configure a Nanelo API Key yet."
+    _err "Please set NANELO_TOKEN and try again."
+    _err "Login to Nanelo.com and go to Settings > API Keys to get a Key"
+    return 1
+  fi
+  _saveaccountconf_mutable NANELO_TOKEN "$NANELO_TOKEN"
+
+  _info "Deleting resource record $fulldomain"
+  response="$(_get "$NANELO_API$NANELO_TOKEN/dns/deleterecord?type=TXT&ttl=60&name=${fulldomain}&value=${txtvalue}")"
+  if _contains "${response}" 'success'; then
+    return 0
+  fi
+  _err "Could not delete resource record, please check the logs"
+  _err "${response}"
+  return 1
+}
diff --git a/dnsapi/dns_vultr.sh b/dnsapi/dns_vultr.sh
index 58f14be1..54e5b6ce 100644
--- a/dnsapi/dns_vultr.sh
+++ b/dnsapi/dns_vultr.sh
@@ -78,7 +78,7 @@ dns_vultr_rm() {
     return 1
   fi
 
-  _record_id="$(echo "$response" | tr '{}' '\n' | grep '"TXT"' | grep -- "$txtvalue" | tr ',' '\n' | grep -i 'id' | cut -d : -f 2)"
+  _record_id="$(echo "$response" | tr '{}' '\n' | grep '"TXT"' | grep -- "$txtvalue" | tr ',' '\n' | grep -i 'id' | cut -d : -f 2 | tr -d '"')"
   _debug _record_id "$_record_id"
   if [ "$_record_id" ]; then
     _info "Successfully retrieved the record id for ACME challenge."
@@ -116,7 +116,7 @@ _get_root() {
       return 1
     fi
 
-    if printf "%s\n" "$response" | grep '^\{.*\}' >/dev/null; then
+    if printf "%s\n" "$response" | grep -E '^\{.*\}' >/dev/null; then
       if _contains "$response" "\"domain\":\"$_domain\""; then
         _sub_domain="$(echo "$fulldomain" | sed "s/\\.$_domain\$//")"
         return 0
diff --git a/notify/smtp.sh b/notify/smtp.sh
index 293c665e..f5ebebca 100644
--- a/notify/smtp.sh
+++ b/notify/smtp.sh
@@ -169,7 +169,7 @@ _clean_email_header() {
 # email
 _email_has_display_name() {
   _email="$1"
-  expr "$_email" : '^.*[<>"]' >/dev/null
+  echo "$_email" | grep -q -E '^.*[<>"]'
 }
 
 ##
@@ -249,7 +249,7 @@ _mime_encoded_word() {
   _text="$1"
   # (regex character ranges like [a-z] can be locale-dependent; enumerate ASCII chars to avoid that)
   _ascii='] $`"'"[!#%&'()*+,./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ~^_abcdefghijklmnopqrstuvwxyz{|}~-"
-  if expr "$_text" : "^.*[^$_ascii]" >/dev/null; then
+  if echo "$_text" | grep -q -E "^.*[^$_ascii]"; then
     # At least one non-ASCII char; convert entire thing to encoded word
     printf "%s" "=?UTF-8?B?$(printf "%s" "$_text" | _base64)?="
   else