Syntax highlighter is confused by a slashy string composited from substrings and ended by a final "/$/"

import java.util.regex.Pattern;

public class Syntax {
    
    private final static String OPTIONALLY_SIGNED_INT = /((\+|\-)?(\d+))/
    private final static String OPTIONALLY_NEG_INT = /((\-)?(\d+))/
    private final static String SIGNED_INT = /((\+|\-)(\d+))/
    
    private final static Pattern PAT_T1 = ~(/^/ + OPTIONALLY_SIGNED_INT + /((X|x)*)$/)
    private final static Pattern PAT_T2 = ~(/^/ + OPTIONALLY_SIGNED_INT + /\s*(<|<=|=<|>|>=|=>|\-|\.\.|\.\.\.|&#8804;|&#8805;)$/)
    private final static Pattern PAT_T3 = ~(/^(<|<=|=<|>|>=|=>|\.\.|\.\.\.|&#8804;|&#8805;)\s*/ + OPTIONALLY_SIGNED_INT + /$/)
    private final static Pattern PAT_T3X = ~(/^(\-)\s*/ + SIGNED_INT  + /$/) // special case of T3integer
    private final static Pattern PAT_T3XX = ~(/^(\-)\s+/ + OPTIONALLY_NEG_INT + /$/) // special case of T3
    private final static Pattern PAT_T4 = ~(/^/ + OPTIONALLY_SIGNED_INT + /\s*(,|\.\.|\.\.\.)\s*/  + OPTIONALLY_SIGNED_INT + /$/)
    private final static Pattern PAT_T4X = ~(/^/ + OPTIONALLY_SIGNED_INT + /\s*(\-)\s*/ + SIGNED_INT + /$/) // special case of T4
    private final static Pattern PAT_T4XX = ~(/^/ + OPTIONALLY_SIGNED_INT + /\s*(\-)\s+/ + OPTIONALLY_NEG_INT + /$/) // special case of T4
    
 }