diff --git a/app/models/custom_field.rb b/app/models/custom_field.rb
index ec8c5de8d..b354091af 100644
--- a/app/models/custom_field.rb
+++ b/app/models/custom_field.rb
@@ -101,7 +101,8 @@ class CustomField < ApplicationRecord
     'version_status',
     'extensions_allowed',
     'full_width_layout',
-    'thousands_delimiter'
+    'thousands_delimiter',
+    'value_mask'
   )
 
   def copy_from(arg, options={})
diff --git a/app/views/custom_fields/formats/_string.html.erb b/app/views/custom_fields/formats/_string.html.erb
index 08aac8eb2..cf22455d3 100644
--- a/app/views/custom_fields/formats/_string.html.erb
+++ b/app/views/custom_fields/formats/_string.html.erb
@@ -2,3 +2,4 @@
 <p><%= f.check_box :text_formatting, {:label => :setting_text_formatting, :data => {:disables => '#custom_field_url_pattern'}}, 'full', '' %></p>
 <p><%= f.text_field(:default_value) %></p>
 <p><%= f.text_field :url_pattern, :size => 50, :label => :label_link_values_to %></p>
+<p><%= f.text_field :value_mask, size: 50, label: 'Value mask' %></p>
diff --git a/lib/redmine/field_format.rb b/lib/redmine/field_format.rb
index e3ebc0398..08e6f5e09 100644
--- a/lib/redmine/field_format.rb
+++ b/lib/redmine/field_format.rb
@@ -250,7 +250,7 @@ module Redmine
         casted = cast_value(custom_field, value, customized)
         if html && custom_field.url_pattern.present?
           texts_and_urls = Array.wrap(casted).map do |single_value|
-            text = view.format_object(single_value, html: false).to_s
+            text = custom_field.value_mask.present? ? value_from_pattern(custom_field, single_value) : view.format_object(single_value, html: false).to_s
             url = url_from_pattern(custom_field, single_value, customized)
             [text, url]
           end
@@ -258,6 +258,8 @@ module Redmine
             view.link_to text, url
           end
           sanitize_html links.join(', ')
+        elsif html && custom_field.value_mask.present?
+          value_from_pattern(custom_field, single_value)
         else
           casted
         end
@@ -267,6 +269,22 @@ module Redmine
         Redmine::WikiFormatting::HtmlSanitizer.call(html).html_safe
       end
 
+      # Returns a value generated with the custom field Regex pattern
+      # %m1%, %m2%... => capture groups matches of the custom field regexp if defined
+      def value_from_pattern(custom_field, value)
+        val = custom_field.value_mask.to_s.dup
+        if custom_field.regexp.present?
+          val.gsub!(%r{%m(\d+)%}) do
+            m = $1.to_i
+            if matches ||= value.to_s.match(Regexp.new(custom_field.regexp))
+              val = matches[m].to_s
+            end
+          end
+        end
+        val
+      end
+      protected :value_from_pattern
+
       # Returns an URL generated with the custom field URL pattern
       # and variables substitution:
       # %value% => the custom field value
@@ -396,11 +414,11 @@ module Redmine
       add 'string'
       self.searchable_supported = true
       self.form_partial = 'custom_fields/formats/string'
-      field_attributes :text_formatting
+      field_attributes :text_formatting, :value_mask
 
       def formatted_value(view, custom_field, value, customized=nil, html=false)
         if html
-          if custom_field.url_pattern.present?
+          if custom_field.url_pattern.present? || custom_field.value_mask.present?
             super
           elsif custom_field.text_formatting == 'full'
             view.textilizable(value, :object => customized)