Elisp Regex Match Commas Outside of Parenthesis
I'm having an issue trying to get regex grouping to occur correctly. I have an string, say:
dtASDF[a, b, c]
I use the expression:
dt\(.*\)\[\(.*\), \(.*\), \(.*\)\]
And it groups the a, b, and c seperatly, which is perfect. The issue is that the string might be:
dtASDF[a, .(b, c), .(d, e)]
In which case the above expression doesn't work, since it's just looking for commas. So the question is, since emacs doesn't have lookarounds, is there a way to group by comma seperation, but not if the commas are between parenthesis?
In other words, the grouping here should be: a, .(b, c), .(d, e).
I'm aware similar questions exist on SO, but I couldn't find one relevant for elisp regex, which is tricky as it doesn't feature lookarounds that are typically used for this sort of thing.
regex emacs
asked Nov 15 '18 at 21:10
bk18bk18
897317
add a comment |
I'm having an issue trying to get regex grouping to occur correctly. I have an string, say:
dtASDF[a, b, c]
I use the expression:
dt\(.*\)\[\(.*\), \(.*\), \(.*\)\]
And it groups the a, b, and c seperatly, which is perfect. The issue is that the string might be:
dtASDF[a, .(b, c), .(d, e)]
In which case the above expression doesn't work, since it's just looking for commas. So the question is, since emacs doesn't have lookarounds, is there a way to group by comma seperation, but not if the commas are between parenthesis?
In other words, the grouping here should be: a, .(b, c), .(d, e).
I'm aware similar questions exist on SO, but I couldn't find one relevant for elisp regex, which is tricky as it doesn't feature lookarounds that are typically used for this sort of thing.
regex emacs
asked Nov 15 '18 at 21:10
bk18bk18
897317
No dice. I think you need those double escapes in emacs.
– bk18
Nov 15 '18 at 21:29
Yeah that's not doing it either. That's not matching anything. Elisp is weird about \ vs The question could probably be answered with a simpler example, in elisp, filter(asdf, asdf), asdfinto two groups:(asdf, asdf)andasdf
– bk18
Nov 15 '18 at 21:34
In my example,[.*?]matches just the periods indtASDF[a, .(b, c), .(d, e)].\[.*?\]matches everything insde and including[...]
– bk18
Nov 15 '18 at 21:40
add a comment |
I'm having an issue trying to get regex grouping to occur correctly. I have an string, say:
dtASDF[a, b, c]
I use the expression:
dt\(.*\)\[\(.*\), \(.*\), \(.*\)\]
And it groups the a, b, and c seperatly, which is perfect. The issue is that the string might be:
dtASDF[a, .(b, c), .(d, e)]
In which case the above expression doesn't work, since it's just looking for commas. So the question is, since emacs doesn't have lookarounds, is there a way to group by comma seperation, but not if the commas are between parenthesis?
In other words, the grouping here should be: a, .(b, c), .(d, e).
I'm aware similar questions exist on SO, but I couldn't find one relevant for elisp regex, which is tricky as it doesn't feature lookarounds that are typically used for this sort of thing.
regex emacs
asked Nov 15 '18 at 21:10
bk18bk18
897317
I'm having an issue trying to get regex grouping to occur correctly. I have an string, say:
dtASDF[a, b, c]
I use the expression:
dt\(.*\)\[\(.*\), \(.*\), \(.*\)\]
And it groups the a, b, and c seperatly, which is perfect. The issue is that the string might be:
dtASDF[a, .(b, c), .(d, e)]
In which case the above expression doesn't work, since it's just looking for commas. So the question is, since emacs doesn't have lookarounds, is there a way to group by comma seperation, but not if the commas are between parenthesis?
In other words, the grouping here should be: a, .(b, c), .(d, e).
I'm aware similar questions exist on SO, but I couldn't find one relevant for elisp regex, which is tricky as it doesn't feature lookarounds that are typically used for this sort of thing.
regex emacs
regex emacs
asked Nov 15 '18 at 21:10
bk18bk18
897317
asked Nov 15 '18 at 21:10
bk18bk18
897317
asked Nov 15 '18 at 21:10
bk18bk18
897317
asked Nov 15 '18 at 21:10
bk18bk18
897317
asked Nov 15 '18 at 21:10
bk18bk18
897317
897317
No dice. I think you need those double escapes in emacs.
– bk18
Nov 15 '18 at 21:29
Yeah that's not doing it either. That's not matching anything. Elisp is weird about \ vs The question could probably be answered with a simpler example, in elisp, filter(asdf, asdf), asdfinto two groups:(asdf, asdf)andasdf
– bk18
Nov 15 '18 at 21:34
In my example,[.*?]matches just the periods indtASDF[a, .(b, c), .(d, e)].\[.*?\]matches everything insde and including[...]
– bk18
Nov 15 '18 at 21:40
add a comment |
No dice. I think you need those double escapes in emacs.
– bk18
Nov 15 '18 at 21:29
Yeah that's not doing it either. That's not matching anything. Elisp is weird about \ vs The question could probably be answered with a simpler example, in elisp, filter(asdf, asdf), asdfinto two groups:(asdf, asdf)andasdf
– bk18
Nov 15 '18 at 21:34
In my example,[.*?]matches just the periods indtASDF[a, .(b, c), .(d, e)].\[.*?\]matches everything insde and including[...]
– bk18
Nov 15 '18 at 21:40
No dice. I think you need those double escapes in emacs.
– bk18
Nov 15 '18 at 21:29
No dice. I think you need those double escapes in emacs.
– bk18
Nov 15 '18 at 21:29
Yeah that's not doing it either. That's not matching anything. Elisp is weird about \ vs The question could probably be answered with a simpler example, in elisp, filter
(asdf, asdf), asdf into two groups: (asdf, asdf) and asdf– bk18
Nov 15 '18 at 21:34
Yeah that's not doing it either. That's not matching anything. Elisp is weird about \ vs The question could probably be answered with a simpler example, in elisp, filter
(asdf, asdf), asdf into two groups: (asdf, asdf) and asdf– bk18
Nov 15 '18 at 21:34
In my example,
[.*?] matches just the periods in dtASDF[a, .(b, c), .(d, e)]. \[.*?\] matches everything insde and including [...]– bk18
Nov 15 '18 at 21:40
In my example,
[.*?] matches just the periods in dtASDF[a, .(b, c), .(d, e)]. \[.*?\] matches everything insde and including [...]– bk18
Nov 15 '18 at 21:40
add a comment |
1 Answer
1
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oldest
votes
How about this as the grouping pattern?
"\(\.([^)]*)\|.*?\)"
So in full:
"dt\(.*\)\[\(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\)\]"
n.b. If you want to get verbose-but-readable with the rx macro, you can write that as:
(rx "dt" (group (zero-or-more not-newline)) "["
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
"]")
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
I highly recommendM-x re-builder(and see also emacs.stackexchange.com/q/5568/454 regarding that).
– phils
Nov 15 '18 at 21:42
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:dt[a, .(b = mean(c, d), d), .(e, f)]The second interior set of parens break it.
– bk18
Nov 15 '18 at 21:52
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
You would instead want to write elisp code to parse it, using the likes of theforward-sexpfunction to move across a balanced expression. (Which would be a different question.)
– phils
Nov 15 '18 at 21:57
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
oldest
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active
oldest
votes
How about this as the grouping pattern?
"\(\.([^)]*)\|.*?\)"
So in full:
"dt\(.*\)\[\(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\)\]"
n.b. If you want to get verbose-but-readable with the rx macro, you can write that as:
(rx "dt" (group (zero-or-more not-newline)) "["
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
"]")
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
I highly recommendM-x re-builder(and see also emacs.stackexchange.com/q/5568/454 regarding that).
– phils
Nov 15 '18 at 21:42
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:dt[a, .(b = mean(c, d), d), .(e, f)]The second interior set of parens break it.
– bk18
Nov 15 '18 at 21:52
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
You would instead want to write elisp code to parse it, using the likes of theforward-sexpfunction to move across a balanced expression. (Which would be a different question.)
– phils
Nov 15 '18 at 21:57
add a comment |
How about this as the grouping pattern?
"\(\.([^)]*)\|.*?\)"
So in full:
"dt\(.*\)\[\(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\)\]"
n.b. If you want to get verbose-but-readable with the rx macro, you can write that as:
(rx "dt" (group (zero-or-more not-newline)) "["
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
"]")
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
I highly recommendM-x re-builder(and see also emacs.stackexchange.com/q/5568/454 regarding that).
– phils
Nov 15 '18 at 21:42
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:dt[a, .(b = mean(c, d), d), .(e, f)]The second interior set of parens break it.
– bk18
Nov 15 '18 at 21:52
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
You would instead want to write elisp code to parse it, using the likes of theforward-sexpfunction to move across a balanced expression. (Which would be a different question.)
– phils
Nov 15 '18 at 21:57
add a comment |
How about this as the grouping pattern?
"\(\.([^)]*)\|.*?\)"
So in full:
"dt\(.*\)\[\(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\)\]"
n.b. If you want to get verbose-but-readable with the rx macro, you can write that as:
(rx "dt" (group (zero-or-more not-newline)) "["
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
"]")
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
How about this as the grouping pattern?
"\(\.([^)]*)\|.*?\)"
So in full:
"dt\(.*\)\[\(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\), \(\.([^)]*)\|.*?\)\]"
n.b. If you want to get verbose-but-readable with the rx macro, you can write that as:
(rx "dt" (group (zero-or-more not-newline)) "["
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
", "
(group (or (seq ".(" (zero-or-more (not (any ")"))) ")")
(minimal-match (zero-or-more not-newline))))
"]")
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
edited Nov 15 '18 at 21:55
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
answered Nov 15 '18 at 21:40
philsphils
58.6k7109146
58.6k7109146
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
I highly recommendM-x re-builder(and see also emacs.stackexchange.com/q/5568/454 regarding that).
– phils
Nov 15 '18 at 21:42
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:dt[a, .(b = mean(c, d), d), .(e, f)]The second interior set of parens break it.
– bk18
Nov 15 '18 at 21:52
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
You would instead want to write elisp code to parse it, using the likes of theforward-sexpfunction to move across a balanced expression. (Which would be a different question.)
– phils
Nov 15 '18 at 21:57
add a comment |
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
I highly recommendM-x re-builder(and see also emacs.stackexchange.com/q/5568/454 regarding that).
– phils
Nov 15 '18 at 21:42
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:dt[a, .(b = mean(c, d), d), .(e, f)]The second interior set of parens break it.
– bk18
Nov 15 '18 at 21:52
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
You would instead want to write elisp code to parse it, using the likes of theforward-sexpfunction to move across a balanced expression. (Which would be a different question.)
– phils
Nov 15 '18 at 21:57
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
:thumbsup: Thank you. Regex will forever be a mystery to me.
– bk18
Nov 15 '18 at 21:41
I highly recommend
M-x re-builder (and see also emacs.stackexchange.com/q/5568/454 regarding that).– phils
Nov 15 '18 at 21:42
I highly recommend
M-x re-builder (and see also emacs.stackexchange.com/q/5568/454 regarding that).– phils
Nov 15 '18 at 21:42
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:
dt[a, .(b = mean(c, d), d), .(e, f)] The second interior set of parens break it.– bk18
Nov 15 '18 at 21:52
Actually, upon further investigation, this doesn't work for everything I need. It solves my example; but what if we had:
dt[a, .(b = mean(c, d), d), .(e, f)] The second interior set of parens break it.– bk18
Nov 15 '18 at 21:52
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
I'm afraid that you cannot use a regular expression to match arbitrary balanced pairs.
– phils
Nov 15 '18 at 21:56
You would instead want to write elisp code to parse it, using the likes of the
forward-sexp function to move across a balanced expression. (Which would be a different question.)– phils
Nov 15 '18 at 21:57
You would instead want to write elisp code to parse it, using the likes of the
forward-sexp function to move across a balanced expression. (Which would be a different question.)– phils
Nov 15 '18 at 21:57
add a comment |
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No dice. I think you need those double escapes in emacs.
– bk18
Nov 15 '18 at 21:29
Yeah that's not doing it either. That's not matching anything. Elisp is weird about \ vs The question could probably be answered with a simpler example, in elisp, filter
(asdf, asdf), asdfinto two groups:(asdf, asdf)andasdf– bk18
Nov 15 '18 at 21:34
In my example,
[.*?]matches just the periods indtASDF[a, .(b, c), .(d, e)].\[.*?\]matches everything insde and including[...]– bk18
Nov 15 '18 at 21:40