diff --git a/EXAMPLES.md b/EXAMPLES.md
index ed233ce..28f6c01 100644
--- a/EXAMPLES.md
+++ b/EXAMPLES.md
@@ -242,7 +242,7 @@ So, let's define a custom mapping for `#`.
 if !exists('g:easy_align_delimiters')
   let g:easy_align_delimiters = {}
 endif
-let g:easy_align_delimiters['#'] = { 'pattern': '#\+', 'ignores': ['String'] } }
+let g:easy_align_delimiters['#'] = { 'pattern': '#', 'ignores': ['String'] } }
 ```
 
 Notice that the rule overrides `ignores` attribute in order *not to ignore*
@@ -252,7 +252,37 @@ Then on `<Enter>#`, we get
 
 ```ruby
 apple = 1         # comment not aligned
-apricot = 'A#B'
+apricot = 'DAD' + 'F#AD'
 banana = 'string' # comment 2
 ```
 
+If you don't want to define a rule, you can do the same with the following
+command:
+
+```vim
+" Using regular expression /#/
+" - "is" is fuzzy-matched to "*i*gnore*s*"
+:EasyAlign/#/{'is':['String']}
+```
+
+In this case, the second line is ignored as it doesn't contain `#`. (The one
+highlighted as String is ignored.) If you don't want the second line to be
+ignored, set `g:easy_align_ignore_unmatched` to 0, or use the following
+commands:
+
+```vim
+" Using predefined rule with delimiter key #
+:EasyAlign#{'iu':0}`
+
+" Using regular expression /#/
+:EasyAlign/#/{'is':['String'],'iu':0}`
+```
+
+Then we get,
+
+```ruby
+apple = 1                # comment not aligned
+apricot = 'DAD' + 'F#AD'
+banana = 'string'        # comment 2
+```
+
diff --git a/autoload/easy_align.vim b/autoload/easy_align.vim
index 8b88796..58944ca 100644
--- a/autoload/easy_align.vim
+++ b/autoload/easy_align.vim
@@ -116,21 +116,25 @@ endfunction
 
 function! s:normalize_options(opts)
   let ret = {}
-  for [k, v] in items(a:opts)
+  for k in keys(a:opts)
+    let v = a:opts[k]
     let k = s:fuzzy_lu(k)
     " Backward-compatibility
     if k == 'margin_left'  | let k = 'left_margin'  | endif
     if k == 'margin_right' | let k = 'right_margin' | endif
     let ret[k] = v
+    unlet v
   endfor
   return s:validate_options(ret)
 endfunction
 
 function! s:validate_options(opts)
-  for [k, v] in items(a:opts)
+  for k in keys(a:opts)
+    let v = a:opts[k]
     if index(s:known_options[k], type(v)) == -1
       call s:exit("Invalid type for option: ". k)
     endif
+    unlet v
   endfor
   return a:opts
 endfunction
@@ -175,7 +179,7 @@ function! s:do_align(just, all_tokens, fl, ll, fc, lc, pattern, nth, ml, mr, sti
       endif
 
       " Skip comment line
-      if concat && len(tokens) == 1
+      if concat && len(tokens) == 1 && a:ignore_unmatched
         let tokens = []
       endif
 
diff --git a/test/regexp.expected b/test/regexp.expected
index 46763af..de25c1d 100644
--- a/test/regexp.expected
+++ b/test/regexp.expected
@@ -85,3 +85,9 @@ data;;exchange: ;format
 apple;:         banana::cake
 data;;exchange: ;format
 
+```ruby
+apple = 1                # comment not aligned
+apricot = 'DAD' + 'F#AD'
+banana = 'Gros Michel'   # comment 2
+```
+
diff --git a/test/regexp.md b/test/regexp.md
index 483fec7..3a31b5a 100644
--- a/test/regexp.md
+++ b/test/regexp.md
@@ -4,3 +4,9 @@
 apple;:banana::cake
 data;;exchange:;format
 
+```ruby
+apple = 1 # comment not aligned
+apricot = 'DAD' + 'F#AD'
+banana = 'Gros Michel' # comment 2
+```
+
diff --git a/test/regexp.script b/test/regexp.script
index 9e9d273..760c3ea 100644
--- a/test/regexp.script
+++ b/test/regexp.script
@@ -1 +1 @@
-4Gvipjyvip:EasyAlign:
Pvip:EasyAlign*:
Pvip:EasyAlign-:
Pvip:EasyAlign * :
Pvip:EasyAlign -2 :
Pvip:EasyAlign -2:
Pvip:easyA€kb€kb€kb€kb€kbEasAli€kb€kb€kbyAlign *:
Pvip:EasyAlign;
Pvip:EasyAlign /;/
Pvip:EasyAlign/;/
Pvip:EasyAlign*/;/
Pvip:e€kbEasyAlign/[:;]\+/
Pvip:EasyAlign*/[:;]\+/
Pvip:EasyAlign* /[:;]\+/
Pvip:EasyAlign */[:;]\+/
Pvip:EasyAlign   *   [:€kb€kb/[:;]\+/   
Pvip:EasyAlign*[:;]\+€kb€kb€kb€kb€kb€kb€kb=/[€kb€kb€kb-/[:;]\+/
Pvip:EasyAlign-2/[:;\€kb\€kb]\+/
Pvip:EasyAlign/[:;]\+/{ 'l': '<<<', 'r': '>>>'}  
Pvip:EasyAlign/[:;]\+/{'l':''m€kb, 's': 1}
Pvip:EasyAlign * /€kb /[:;]€kb\€kb]\+/ {'stick_to': 1, 'le': '???', 'marr': '~~~'}  
Pvip:EasyAlign /../
Pvip:EasyAlign*/../
Pvip:EasyAlign ** €kb/[:;]/€kb€kb\+]/
Pvip:EasyAlign/[:;\€kb\€kb]\+/'€kb{'rm':'____'}
Pvip:EasyAlign**[€kb/[:;]\+/
Pvip:EasyAlign!**/[:;]\+/
Pfbjfm:EasyAlign/[:;]\+/

+4Gvipjyvip:EasyAlign:
Pvip:EasyAlign*:
Pvip:EasyAlign-:
Pvip:EasyAlign * :
Pvip:EasyAlign -2 :
Pvip:EasyAlign -2:
Pvip:easyA€kb€kb€kb€kb€kbEasAli€kb€kb€kbyAlign *:
Pvip:EasyAlign;
Pvip:EasyAlign /;/
Pvip:EasyAlign/;/
Pvip:EasyAlign*/;/
Pvip:e€kbEasyAlign/[:;]\+/
Pvip:EasyAlign*/[:;]\+/
Pvip:EasyAlign* /[:;]\+/
Pvip:EasyAlign */[:;]\+/
Pvip:EasyAlign   *   [:€kb€kb/[:;]\+/   
Pvip:EasyAlign*[:;]\+€kb€kb€kb€kb€kb€kb€kb=/[€kb€kb€kb-/[:;]\+/
Pvip:EasyAlign-2/[:;\€kb\€kb]\+/
Pvip:EasyAlign/[:;]\+/{ 'l': '<<<', 'r': '>>>'}  
Pvip:EasyAlign/[:;]\+/{'l':''m€kb, 's': 1}
Pvip:EasyAlign * /€kb /[:;]€kb\€kb]\+/ {'stick_to': 1, 'le': '???', 'marr': '~~~'}  
Pvip:EasyAlign /../
Pvip:EasyAlign*/../
Pvip:EasyAlign ** €kb/[:;]/€kb€kb\+]/
Pvip:EasyAlign/[:;\€kb\€kb]\+/'€kb{'rm':'____'}
Pvip:EasyAlign**[€kb/[:;]\+/
Pvip:EasyAlign!**/[:;]\+/
Pfbjfm:EasyAlign/[:;]\+/
90Gvip:EasyAlign/#/{'is':['String'],'iu':0}