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[Suggestion:] v in RegExMatch('x','y',&v) should return 0 or false
Posted: 19 Jan 2024, 23:51
by V2User
I wish
v in
RegExMatch('x','y',&v) to be set to
0/
false rather than
"", when match is not found.
See these code below:
<code a:>
Code: Select all
;(1) Match is not found, and v will be ""
RegExMatch('x','y',&v)
;(2)A Match is found, and both will be a matchObj in v this time, and v[] is ""
RegExMatch('x','y?',&v)
,RegExMatch('x',"",&v)
<code b:>
Code: Select all
;(1) A subPattern is found, and v['c'] is ""
;It's the with v[] in <code a>. It's right.
RegExMatch('x','(?<c>y?)',&v)
,OutputDebug(v['c'])
;(2) SubPattern is not found, but v['c'] is also ""
;Both results are the same, this time.
;This is inconsist with <code a> where both results are different.
;It is not reasonable.
; I think v['c'] is better to return 0 this time.
RegExMatch('x','(?<c>y)|.*',&v)
,OutputDebug(v['c'])
;(3) SubPattern name is not found and it will return unset.
;At least, I wish v['f'] would return unset, just like v.f??XXX
RegExMatch('x','(?<c>y)|.*',&v)
;,OutputDebug(v['f'])
I wish both
v in
<code a> and
v['c'] in
<code b> would return 0, when match is not found.
By the way, the suggestion is backward compatible. Because both
"" and
0 works equally for an
If keyword.
Re: [Suggestion:] v in RegExMatch('x','y',&v) should return 0 or false
Posted: 20 Jan 2024, 04:02
by just me
V2User wrote:
By the way, the suggestion is backward compatible. Because both "" and 0 works equally for a If keyword.
So why should it be changed?
Re: [Suggestion:] v in RegExMatch('x','y',&v) should return 0 or false
Posted: 20 Jan 2024, 06:29
by V2User
just me wrote: ↑20 Jan 2024, 04:02
V2User wrote:
By the way, the suggestion is backward compatible. Because both "" and 0 works equally for a If keyword.
So why should it be changed?
If it finds a blank String in sub pattern, then returning
"" is reasonable.
If it doesn't find in sub pattern, then it might be better to return
0, for distinguishing, I think.
Thereupon, through what it returns, we could know exactly whether it has found or not.
Re: [Suggestion:] v in RegExMatch('x','y',&v) should return 0 or false
Posted: 20 Jan 2024, 09:52
by iseahound
Completely agree at how frustrating this is. I'm just using type(c) == RegExMatchInfo for now, but in my opinion an empty array with a default of "" should fix most errors like v[1]. Also Lexikos might make it unset because that should be the default return value for v2.1
Re: [Suggestion:] v in RegExMatch('x','y',&v) should return 0 or false
Posted: 20 Jan 2024, 17:50
by just me
V2User wrote:
Thereupon, through what it returns, we could know exactly whether it has found or not.
Code: Select all
MsgBox(RegExMatch('x','(?<c>y)|.*',&v)) ; 1
MsgBox(v.Count) ; 1
MsgBox(v.Pos["c"]) ; 0 !!!
V2User wrote:
;At least, I wish v['f'] would return unset, just like v.f??XXX
If no property named "f" exists, it cannot be unset.
Re: [Suggestion:] v in RegExMatch('x','y',&v) should return 0 or false
Posted: 20 Jan 2024, 20:37
by V2User
Maybe
v.f? could return unset in language support.
