[antlr-interest] Cannot match strings combining terminals w/o spaces between

[Samuel Lampa]

I got problems matching the string:
"history":

... with the following ANTLR code (work in progress, really):
(STRING)':'

Where I have the STRING terminal defined as:
STRING    :    '"'('a'..'z'|'A'..'Z')+'"'
     ;

It works if I add the ending colon in the STRING definition itself, like 
so (and then remove it from the parent rule):
STRING    :    '"'('a'..'z'|'A'..'Z')+'"'':'
     ;

... but this of course makes for a less general string definition :/ ... 
Any ideas how I should go about this?

Best regards
// Samuel


Addendum: The full input string and EBNF code is as follows:

=== Input string ===

     sam_to_bam.py
       --input1=$source.input1
       --dbkey=${input1.metadata.dbkey}
       #if $source.index_source == "history":
         --ref_file=$source.ref_file
       #else
         --ref_file="None"
       #end if
       --output1=$output1
       --index_dir=${GALAXY_DATA_INDEX_DIR}


=== ANTLR code ===

grammar GalaxyToolConfig;
options {output=AST;}

command    :    binary param* ifstatement '\n' text? ELSE text? ENDIF text?
     ;

binary     :    WORD
     ;

param     :    '--' PARAMNAME '=' ( VARIABLE | STRING )
     ;

ifstatement
     :    IF ( STRING | VARIABLE ) EQ ( (STRING)':' | (VARIABLE)':' )
     ;

text     :    WORD WORD*
     ;

IF    :    '#if'
     ;

ELSE    :    '#else'
     ;

ENDIF     :    '#end if'
     ;

EQ     :    '=='
     ;

COLON     :    ':'
     ;

PARAMNAME:    ('a'..'z')('a'..'z'|'A'..'Z'|'0'..'9'|'.'|'_')*
     ;

STRING    :    '"'('a'..'z'|'A'..'Z')+'"'
     ;

VARIABLE
     :    '$''{'?PARAMNAME'}'?
     ;


// CHAR    :    
('a'..'z'|'A'..'Z'|'0'..'9'|'_'|'.'|'$'|'{'|'}'|'='|'"'|'-'|':'|';')
//     ;


WORD    :    (~(' '|'\t'|'\r'|'\n'))+
     ;

WS  :   ( ' '
         | '\t'
         | '\r'
         | '\n'
         ) {$channel=HIDDEN;}
     ;




-- 
System Expert / Bioinformatician
SNIC-UPPMAX / SciLifeLab Uppsala
Uppsala University, Sweden
--------------------------------------
E-mail: samuel.lampa at scilifelab.uu.se
Phone: +46 (0)18 - 471 1060
WWW: http://www.uppmax.uu.se
Uppnex: https://www.uppnex.uu.se