Regex 101 Answer I10 - Extract repeating hex blocks from a string

Regex 101 Exercise I10 - Extract repeating hex blocks from a string

Given the string:

PCORR:BLOCK=V5CCH,IA=H'22EF&H'2354&H'4BD4&H'4C4B&H'4D52&H'4DC9;

Extract all the hex numbers in the form “H’xxxx”

*****

You can match the hex digits with:

H'(?<Values>[0-9a-fA-F]{4})

Like our last example, you can call Match() multiple time, use Matches(), or do it in a single call with:

(H'(?<Values>[0-9a-fA-F]{4})&)+

Comments

• Anonymous
  March 14, 2006
  Actually your last pattern misses the final hex number... unless you do something like
  
  r.Match(str + "&")
  
  or
  
  (H'(?<Values>[0-9a-fA-F]{4})&?)+
  
  or
  
  (H'(?<Values>[0-9a-fA-F]{4})(&H'(?<Values>[0-9a-fA-F]{4}))*)+
  
  (...or does that not work?  it seems suspicious to have two capturing clauses with the same name...)
• Anonymous
  March 14, 2006
  Er, the + is superfluous on my last regex.  Should be:
  H'(?<Values>[0-9a-fA-F]{4})(&H'(?<Values>[0-9a-fA-F]{4}))
  
  or better
  
  H'(?<Values>[0-9a-fA-F]{4}) # first hex number
  (
  __ & # second and further hex numbers are separated with &
  __ H'(?<Values>[0-9a-fA-F]{4}) # second and further hex number
  ) # further hex numbers are optional
• Anonymous
  March 16, 2006
  (H'(?<Values>[0-9a-fA-F]{4})[&;])+
• Anonymous
  June 08, 2009
  PingBack from http://quickdietsite.info/story.php?id=4517