Inverse searching Regular Expression problem

[ktfung]

Hi,
I have a problem in Regular Expression.

File 1 is:
ABCgg003D

if I want to search with any text start with BC and the end is 003 in File 1. I use BC*003 in find function. That work fine. Found 1 result.

File 2 is:
ABCgg002D

if i want text start with BC but not end with 003 in File 2. I have try BC*~^{003^}. I suppose 1 will be found. But the result is 0.

What Regular Expression should i use?
THX:)

[Mofi]

First read the sticky forum topic in this forum. Then tell us your version of UE/UES and which regex engine you use.

Usually it is not possible to search "if a string is not at ...". With the UltraEdit and the Unix engine it is definitely not possible what you want. Only possible is "next character is not a or b or c or ..." by using [~abc] in UltraEdit syntax or [^abc] in Unix syntax.

If BC*~^{003^} should be an UltraEdit regex search string, than this is a completely invalid one and so does never find something.

[pietzcker]

If you have an UE version >12, you can use the Perl regex engine that features negative lookahead.

Code: Select all

BC(?:(?!003).)*$

will find "BC" followed by anything except 003 until the end of line.

I.e., ABCgg003D won't match, ABCgg002d will match BCgg002d.

HTH,
Tim

[ktfung]

Thanks for replies!

My UltraEdit version is 13.10a+1.

I have tried

Code: Select all

BC(?:(?!003).)*$

, but the result still is 0 in File 2 (BCgg002d). Should I configure something before use Perl regex engine?

[pietzcker]

Did you read the sticky, esp. section 2?

And of course, did you check "Regular Expressions" in the Find dialog?