CODEWITHSUNDEEP
regex
flyingfox
flyingfox

Reputation: 13506

Regex to match a string not followed by some string

I have a string block as below

1. While #EngineSpeed$b4tgup#
2. While #AcceleratorPedal$desddd# <=2
3. While #AcceleratorPeda@$desddd# <=2
4. While #AcceleratorPe#al$desddd# <=2
5. While #AcceleratorP@dal$desddd# <=2
6. While #AcceleratorPeda l$desddd# <=2
7. 设置 #AcceleratorPedal$y6qs8m#=@AcceleratorPedal+0.06
8. 设置 #WaitStart$jhx0vu#=11
9. 设置 #WaitStart$jhx0vu#^11
10. 设置 #WaitStart$jhx0vu#_11
11. 设置 #WaitStart$jhx0vu#-11
12. 设置 #AcceleratorQuora$yd6ba3#=1
13. 设置 #AcceleratorQuora$yd6bd3#=1
14.
15. Check #EnginePower#
16. While #EngineSpeed
17. set #WaitStart
18. set #WaitStart<13
19. set #WaitStart<=13
20. set #WaitStart <= 13

Now I want to have a regex to match a substring starts with # but not followed by # or not followed by a substring like this $\w{6}#.

So in the string block above only line 16,17,18,19,20 match,in line 16 the result is #EngineSpeed,in line 17 the result is #WaitStart,the others are not match, in line 20 ,the result is also #WaitStart, it followed by <= 13,not followed by # or $\w{6}#,so it's also match!

For example,in line 15 the string is Check #EnginePower#,it starts with #,but it followed by #,in line 13 the string is 设置 #AcceleratorQuora$yd6bd3#=1,it starts with #,but followed by a substring like $\w{6}#.

I have wrote a regex like this #\w+(?<!#|$\w{6}#),but the test result in RegexBuddy is shown in the picture below,almost every line is match,it doesn't meet my requirement,how can I can modify the regex? Thanks in advance!

enter image description here

Upvotes: 2

Views: 478

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627536

From all the strings above you want to match

  1. While #EngineSpeed
  2. set #WaitStart
  3. set #WaitStart<13
  4. set #WaitStart<=13
  5. set #WaitStart <= 13

You can use

(?<=\s)#\w+(?!.*[@$#])

See this regex demo

Details:

  • (?<=\s) - there must be a whitespace before...
  • # - a literal hash
  • \w+ - 1 or more word chars
  • (?!.*[@$#]) - fail the match if there are @, or $, or # somewhere after the \w+ on the line.

Upvotes: 3

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