grep() - global regular expression match
Your code is so short I was tempted to put it into the examples section. But I don't understand it well enough to be comfortable with that -- in part due to not fully understanding Grep. So I just linked to this topic, which provides your full examples and makes it easier for you to update it.
Thanks.
autohotkey.com/net Site Manager
Contact me by email (polyethene at autohotkey.net) or message tidbit
autohotkey.com/net Site Manager
Contact me by email (polyethene at autohotkey.net) or message tidbit
t = C:\Windows\system32\systeminfo.exe`n s = `n ; separator character between matches, like "|" or "," p = (?<=([\\\.]))\w+ ; pattern to search for t := RegExReplace(t, "(.*?)((" . p . ")|$)", "$2" . s) StringTrimRight t, t, SubStr(t,-2,1) = s ? 3 : 2 MsgBox [%t%]If you want multi char separators, only the StringTrimRight command needs adaptation.
autohotkey.com/net Site Manager
Contact me by email (polyethene at autohotkey.net) or message tidbit
example:
start := (matched := 0) + 1 loop if regexmatch("12345","(?<whole>.*?(?<ANSWER" . a_index . ">\d))",The_,start) and ++matched start += strlen(The_whole) else break msgbox % matched loop % matched msgbox % The_Answer%A_index% exitapp
if this is helpful(?)
ie. regexmatch(HAYSTACK, "(?<whole>" ... rest of match block ... ")",Array_Var_Name, PlaceHolder)
the match block is normal except... in place of (?<named>) use "(?<named" . a_index . ">" for each named match.
or:
if regexmatch(Haystack,"sx) (?<whole>.*? # .*? ie. if there can be optional text between matches (?<ANSWER" . a_index . "> # name of section + index counter \d) # for each section you want to capture )" ; Closing paren for entire match section ,Array_,start)
grep(Haystack, Needle, ByRef outputVar, whichmatchB = 0, positionS = 1, charhopefullyNOTinanymatcheD = ",", matchfromlastZ = true) { Loop If positionS := RegExMatch(Haystack, Needle, X, PositionS) { outPut .= positionS . charhopefullyNotinanymacheD positionS += matchfromlastZ ? StrLen(X) : 1 Y .= (whichmatchB ? X%whichmatchB% : X) . charhopefullyNotinanymacheD } Else { outputVar := SubStr(Y, 1, -1) Return SubStr(outPut, 1, -1) } }
we see your very cool use of the return value (foundposition), but some huge LIMITATIONS with the function:
1) only return one (1) match, not multiple arrayed matches...... [with the simple loop suggested above, can make as many named matches/submatches as desired... ], eg:
start := (matched := 0) + 1 loop if regexmatch("12345","x)(?<whole>.*?(?<ANSWER" . a_index . ">\d)(?<AnswerB" . a_index . ">\d))",The_,start) and ++matched start += strlen(The_whole) else break
2) need a 'pray it isn't in the match result' character to seperate the matches!!!
3) don't return an array....
4) are much slower...
and notably,
as pointed out above in thread, to create a conjoined string with matches, simply use regexreplace to kill everything between matches and insert whatever 'between' string you desire......
Which could be any one. I'll try see if this limitation can be lifted with a new paradigm.only return one (1) match, not multiple arrayed matches
That's true, I usually escape my commas prior to calling grep. Until real arrays/objects are supported AutoHotkey will always have a problem here.need a 'pray it isn't in the match result' character to seperate the matches
In most cases this is better. You can transform the string with Sort, parsing loops and not worry about variable scope within functions.don't return an array
I did a few tests, and I found that it was only ever slightly slower (1-2%). Like I said this function is for convenience, looping is not a new concept. If performance is critical you can write a Dll in ASM and call your exported functions.much slower
In my follow up I listed a few reasons why it's not a practical solution - breaking backreferences is a major worry because I use them a lot.use regexreplace to kill everything between matches
autohotkey.com/net Site Manager
Contact me by email (polyethene at autohotkey.net) or message tidbit
so easy, even pre-beginner can use !!!
STARTER:
use it like this,
RegexMall( HAYSTACK, NEEDLE)
get back
for *each* (?<named_match>xxxxxx)
ie.. "(?<first>\d+)\D+(?<second>\d*?)\s*(?<third>\w+)" is legal.
matched result contained in named matches, eg:
$named_match1 - 9999
function returns # of matches
also:
$ has full matches
$RegEx1-999 has full match for that match #
$0 also has # of matches...
options:
RegexMall(haystack,Needle, "VARIABLE TO USE", "Spacer to use", Position to start in regexreplace)
spacer applies to TOTAL MATCH return string... eg. "$" (if no variable alternative designated)
RegexMall(hay,needle,"THIS_") ->
returns
THIS_namedmatch1
THIS_namedmatch2
etc..
ie. in place of default "$"
/* ; example msgbox % RegexMall("test and more ! and test and more and more!! ","(?<happy>test).*?(?<more>more)","Yes_") "- " Yes_happy1 " " Yes_more2 "`n" Yes_ "-" Yes_0 */ RegExMall(haystack,needle,var = "$",spacer = "", position = 1) { global local tmps, count ; local save$ := %var% loop if !(position := regexmatch(haystack , regexreplace(needle,"(?<!\\)\(\?\<(\w+)>" , "(?<$1" . a_index . ">") , %var% , position) + strlen(%var%) ) break else { tmps .= %var%Regex%a_index% := %var% . spacer ++count } ;%var% := save$ %var% := tmps %var%0 := count return count }
hope this helps!
oh... is about 2-3 times slower than directly doing loop:
pos = 0 loop if !( pos := regexmatch(test, "(?<=is)\s*a\s*(?<match" . a_index . ">[a-z]++)\s*(?<number" . a_index . ">\d+)",$,pos + 1)) break
(as is doing 2 regex's!!)
but..
regex is FAST...
and larger the haystack, lower the time differential..
"S" option degrades performance...
------------------------------------------
ok and a second, FASTER (3x) version,
works also with unnamed match sections "(xxx)"
but less friendly output style.
$1_match#orid
eg:
$1_1
$1_2
$2_1
$2_2
etc..
RegExMatchG(haystack,needle,var = "$",spacer = "", position = 1) { global local tmps, count ; local save$ := %var% loop if !(position := regexmatch(haystack, needle , %var%%a_index%_ , position) + strlen(%var%%a_index%_) ) break else { tmps .= %var%%a_index%_ . spacer ++count } ;%var% := save$ %var% := tmps %var%0 := count return count }
for example:
loop 100 test .= "this is a match 2345," RegExMatchG(test,"(?<=is)\s*(a)\s*(?<match>[a-z]++)\s*(?<number>\d+)") msgbox % benchmark() "-" $1_1 "-" $1_match "`n" $0 "-" $
RegExMall(haystack,needle,var = "$",spacer = "", position = 1) { global [color=red]local tmps, count[/color] ; local save$ := %var% loop
count should also be in local var else the 2nd time u accumulate it, it will always be incremented since u didnt reset the count.
count should also be in local var else the 2nd time u accumulate it, it will always be incremented since u didnt reset the count.
thanks.