SUMMARY
***
There seem to be a issue highlighting text when the regex contains a flag. (?s) is a flag in regex. That's where the issues comes in.
***

This is the text test.
```
fill "y+x*h" mirror. x

    m "rep_mitchell_concatenation_arguments_for_shapes:
     
        skip $""{1=1},$""{2=0},$""{3=1},$""{4=1}
     
        ratio:=cut($""1,0,1)
        if !$ratio error ratio_arg>0==F fi
        sublevel:=abs($""3)+1
        status $ratio,$""2,$sublevel,$""4
        "

    command "+rep_mitchell_concatenation_create_shape:
        skip $""{1=},$""{9=},$""{10=},$""{11=},$""{12=},$""{13=},$""{14=},$""{15=},$""{16=},$""{17=},$""{18=},$""{19=}
        sid,pixel_size,subpixel_level,ratio,angle,reflect_direction,sublevel,fit_inside=$""{1-8}
      
        if $pixel_size<4 error dim_form>=4=F fi
      
        if $_rep_mitchell_concatenation_use_shape_image
         
            $_rep_mitchell_concatenation_shape_image 
            
            _rep_mitchell_concatenation_use_shape_image,_rep_mitchell_concatenation_shape_image=
         
            if d!=1 error d_form_img==1=F fi
         
            if s<=4&&s>1
                if s==3
                    to_gray.
                else
                    s. c,{if(s==4,-3,if(s==2,-1,-s))}
                    to_gray..
                    *[-2,-1]
                fi
            elif s==5
                s. c,-4 cmyk2rgb.. to_gray.. *[-2,-1]
            fi
        else
            if narg($sid)
                if isnum($sid) if isint($sid)
                    sid=${arg\ $sid+1,australia,barbedwire,circle,crosshair,cupid,diamond,dragon,dragonfly,fern,flip,gear,gumleaf,heart,information,kookaburra,mail,mapleleaf,paint_splat,paw,phone,polygon,rooster,shopping_cart,snowflake,star}
                fi fi
            else 
                sid=diamond
            fi
         
            if narg($""{9--1}) 
                shape_$sid {$pixel_size*$subpixel_level},$""{9--1}
            else 
                shape_$sid {$pixel_size*$subpixel_level}
            fi
         
            resize. {ceil([w,h]/$pixel_size)*$pixel_size},100%,100%,0,0,.5,.5
        fi
      
        if $angle-360*floor($angle/360) rotate. $angle,1 fi
      
        if $reflect_direction==1 mirror. x
        elif $reflect_direction==2 mirror. y
        fi
      
        n. 0,1 autocrop. 0
      
        if $fit_inside
            resize2din. {vector2(round($pixel_size)*$ratio)},5
        else
            resize. {vector2(round($pixel_size)*$ratio)},100%,100%,5
        fi
      
        resize. $pixel_size,$pixel_size,100%,100%,0,0,.5,.5
      
        cut. 0,1 n. 0,1
        "

jp " " "" "" ""
```
This would be the regex to test
```
((?<=m )|(?<=command ))(?s)"{1}(.*?)"(?=\s)
```

STEPS TO REPRODUCE
1. Test the text test on regex101 website, and the regex on KDE. Then do the same on Kate.

OBSERVED RESULT
Kate fails to highlight texts which are highlighted in regex101/

EXPECTED RESULT
Kate should successfully highlight texts.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION