>When I have somewhere in text value single backslash char, then everything 
>behind this char will not be highlighted correct.
That is because the Backslash is an ESCAPE character, so you must ESCAPE it and 
use two backslashes if you want it to be interpretedas a literal.
Also, do not forget to enclose your strings in quotes!
IE:
SELECT 'a' || E'\\' || 'b'
UNION ALL
SELECT 'c' || E'\\' || 'd';

https://www.postgresql.org/docs/9.4/static/functions-matching.html#POSIX-ESCAPE-SEQUENCES
 Melvin Davidson 🎸
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      From: "mammoth.po...@gmx.us" <mammoth.po...@gmx.us>
 To: pgadmin-support@postgresql.org 
 Sent: Monday, May 22, 2017 3:17 PM
 Subject: [pgadmin-support] SQL syntax highlightning don't work for single 
backslash '\'
   
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70.85pt 2.0cm 70.85pt;}#yiv1549832465 div.yiv1549832465WordSection1 {}-->When I 
have somewhere in text value single backslash char, then everything behind this 
char will not be highlighted correct.  Simple example 1:  SELECT '\';  Simple 
example 2:  -- Test 1SELECT       a || '\' || bUNION ALL-- Test 2SELECT       c 
|| '\' || d;  Screenshots of syntax highlighting:  Single backslash:    Dual 
backslash:    pgAdmin 4 v1.5Desktop RuntimeWindows 10 x64 1511

   
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