Hello there, I have come across this regex I have tried my best to understand but no luke so far. Would anyone translate it to English words what is it trying to achive?

(?<=(?:^| ))[a-z]

 Thanks,

hope 

Making several assumptions about what options are and aren't on and assuming the language you are trying to do this in supports lookbehinds.  It's trying to match the first letter of a word.

Assumptions: IgnoreCase ON, IgnoreWhitespace OFF

if IgnoreCase is false then it only matches the first letter of words in lowercase.

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Michael

"In theory, theory and practice are the same. In practice, they are not."
Albert Einstein

It matches any lowercase character of the set 'a' to 'z' which has a whitespace before it, or is at the start of your string.

So, from the String "abc Def ghi", it matches the 'a' and 'g'.