Quick perl question

[pushVTEC]

Can someone explain this line to me, I know /d+ searches for a string of digits, but the other stuff could use some explaining.

if($line =~ /:x\d+):\d+[^:]*)[^:]+)[^:]+)/) {

I know it says if line contains then i'm lost.

Does anyone have a good site where the various stuff in that is explained?

 

[Barnaby W. Füi]

(i use a b and c instead of 10/11/12 to keep the alignment more readable)

parts of regex:
1. :
2. x
3. :
4. (\d+)
5. :
6. \d+
7. :
8. ([^:]*)
9. :
a. ([^:]+)
b. :
c. ([^:]+)

explanation:
1. a colon
2. then an x
3. then a colon
4. then one or more digits
5. then a colon
6. then one or more digits
7. then a colon
8. then possibly some non-colon characters
9. then a colon
a. then definitely some non-colon characters
b. then a colon
c. then definitely some non-colon characters

parentheses are only for grouping; all of the parentheses in this case could be taken out and it'd work just the same. (\d+) matches the same as \d+.

 

[pushVTEC]

So the / and / signify the beginning and end of using regular expressions right? BTW thanks a lot for the translation

 

[stndn]

my teacher's perl class notes back when i took his class
it has quite a bit of useful notes that you can read up and try on your own

top of page

and yeah, / signifies the delimiter for the regex. you can also use different delimiters, such as %, |, etc etc... your choice.

 

[notfred]

bbwf pretty much covered it.