\V<pattern> regexps can spell trouble if <pattern> contains backslashes.

plugin/syntastic.vim

@@ -18,7 +18,7 @@ if has('reltime')
     let g:syntastic_start = reltime()
 endif
 
-let g:syntastic_version = '3.3.0-120'
+let g:syntastic_version = '3.3.0-121'
 
 " Sanity checks {{{1
 

syntax_checkers/actionscript/mxmlc.vim

@@ -41,7 +41,7 @@ function! SyntaxCheckers_actionscript_mxmlc_GetHighlightRegex(item)
 
     endif
 
-    return term != '' ? '\V\<' . term . '\>' : ''
+    return term != '' ? '\V\<' . escape(term, '\') . '\>' : ''
 endfunction
 
 function! SyntaxCheckers_actionscript_mxmlc_GetLocList() dict

syntax_checkers/css/prettycss.vim

@@ -26,7 +26,7 @@ set cpo&vim
 function! SyntaxCheckers_css_prettycss_GetHighlightRegex(item)
     let term = matchstr(a:item["text"], '\m (\zs[^)]\+\ze)$')
     if term != ''
-        let term = '\V' . term
+        let term = '\V' . escape(term, '\')
     endif
     return term
 endfunction

syntax_checkers/javascript/jslint.vim

@@ -22,7 +22,7 @@ set cpo&vim
 function! SyntaxCheckers_javascript_jslint_GetHighlightRegex(item)
     let term = matchstr(a:item['text'], '\mExpected .* and instead saw ''\zs.*\ze''')
     if term != ''
-        let term = '\V' . term
+        let term = '\V' . escape(term, '\')
     endif
     return term
 endfunction

syntax_checkers/lex/flex.vim

@@ -26,7 +26,7 @@ function! SyntaxCheckers_lex_flex_GetHighlightRegex(item)
             \ '\m^\(Definition value for\|undefined definition\) \zs{[^}]\+}\ze')
     endif
 
-    return term != '' ? '\V' . term : ''
+    return term != '' ? '\V' . escape(term, '\') : ''
 endfunction
 
 function! SyntaxCheckers_lex_flex_GetLocList() dict

syntax_checkers/lua/luac.vim

@@ -28,7 +28,7 @@ function! SyntaxCheckers_lua_luac_GetHighlightRegex(pos)
             let a:pos['col'] = p[2]
             let result = '\%' . p[2] . 'c'
         else
-            let result = '\V' . near
+            let result = '\V' . escape(near, '\')
         endif
 
         " XXX the following piece of code is evil, and is likely to break
@@ -38,7 +38,7 @@ function! SyntaxCheckers_lua_luac_GetHighlightRegex(pos)
         "if open != ''
         "    let line = str2nr(matchstr(a:pos['text'], '\m(to close ''[^'']\+'' at line \zs[0-9]\+\ze)'))
         "    let group = a:pos['type'] ==? 'E' ? 'SyntasticError' : 'SyntasticWarning'
-        "    call matchadd(group, '\%' . line . 'l\V' . open)
+        "    call matchadd(group, '\%' . line . 'l\V' . escape(open, '\'))
         "endif
     endif
     return result

syntax_checkers/php/php.vim

@@ -20,7 +20,7 @@ set cpo&vim
 
 function! SyntaxCheckers_php_php_GetHighlightRegex(item)
     let term = matchstr(a:item['text'], "\\munexpected '\\zs[^']\\+\\ze'")
-    return term != '' ? '\V' . term : ''
+    return term != '' ? '\V' . escape(term, '\') : ''
 endfunction
 
 function! SyntaxCheckers_php_php_GetLocList() dict

syntax_checkers/po/msgfmt.vim

@@ -20,7 +20,7 @@ set cpo&vim
 
 function! SyntaxCheckers_po_msgfmt_GetHighlightRegex(item)
     let term = matchstr(a:item['text'], '\mkeyword "\zs[^"]\+\ze" unknown')
-    return term != '' ? '\V' . term : ''
+    return term != '' ? '\V' . escape(term, '\') : ''
 endfunction
 
 function! SyntaxCheckers_po_msgfmt_GetLocList() dict

syntax_checkers/python/frosted.vim

@@ -39,7 +39,7 @@ function! SyntaxCheckers_python_frosted_GetLocList() dict
         if len(parts) >= 4
             let e["type"] = parts[1][0]
             let e["text"] = parts[3] . ' [' . parts[1] . ']'
-            let e["hl"] = '\V' . parts[2]
+            let e["hl"] = '\V' . escape(parts[2], '\')
         elseif e["text"] =~? '\v^I\d+:'
             let e["valid"] = 0
         else

syntax_checkers/ruby/mri.vim

@@ -21,7 +21,7 @@ set cpo&vim
 function! SyntaxCheckers_ruby_mri_GetHighlightRegex(i)
     if stridx(a:i['text'], 'assigned but unused variable') >= 0
         let term = split(a:i['text'], ' - ')[1]
-        return '\V\<'.term.'\>'
+        return '\V\<' . escape(term, '\') . '\>'
     endif
 
     return ''

syntax_checkers/texinfo/makeinfo.vim

@@ -20,7 +20,7 @@ set cpo&vim
 
 function! SyntaxCheckers_texinfo_makeinfo_GetHighlightRegex(item)
     let term = matchstr(a:item['text'], "\\m`\\zs[^']\\+\\ze'")
-    return term != '' ? '\V' . term : ''
+    return term != '' ? '\V' . escape(term, '\') : ''
 endfunction
 
 function! SyntaxCheckers_texinfo_makeinfo_GetLocList() dict

syntax_checkers/text/atdtool.vim

@@ -22,7 +22,7 @@ function! SyntaxCheckers_text_atdtool_GetHighlightRegex(item)
     let term = matchstr(a:item['text'], '\m "\zs[^"]\+\ze"\($\| | suggestions:\)')
     if term != ''
         let col = get(a:item, 'col', 0)
-        let term = (col != 0 ? '\%' . col . 'c' : '') . '\V' . term
+        let term = (col != 0 ? '\%' . col . 'c' : '') . '\V' . escape(term, '\')
     endif
     return term
 endfunction

syntax_checkers/vim/vimlint.vim

@@ -29,7 +29,7 @@ function! SyntaxCheckers_vim_vimlint_GetHighlightRegex(item)
             endif
         endif
 
-        return '\V' . (col ? '\%' . col . 'c' : '') . term
+        return '\V' . (col ? '\%' . col . 'c' : '') . escape(term, '\')
     endif
 
     return ''