Regular expression with full match only












2















I know that this hackneyed theme and I read related answers...

However, I will ask...

I have input string in next format: 



3#0.01, 2#0.5, 1#-10, -2#~


So this is a list of values splitted by comma.

I can catch all values with next expression: 



(([-+]?d+)#([-+]?d*.?d+|~))+


It's working fine.



But I want to have no matching if any mistake is presenting in input string, for example: 



MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO


Unfortunately ^ and $ symbols are not helping here.

So my question: how can I stop matching if some part of input string is invalid.

Thanks.



Here is snippet: https://regex101.com/r/Xih0Qk/2






.net regex lookahead lookbehind







share|improve this question

























  • Try (([-+]?bd+)#([-+]?d*.?d+|~B))+

    – Wiktor Stribiżew
    Nov 21 '18 at 17:13











  • Wiktor, thanks for your attempt. But, unfortunately, no.

    – Sergey Alikin
    Nov 21 '18 at 17:49











  • So, you want to match them all only after validating the whole string? Something like regex101.com/r/Xih0Qk/3?

    – Wiktor Stribiżew
    Nov 21 '18 at 17:59











  • Wiktor, that's exactly what I want.

    – Sergey Alikin
    Nov 21 '18 at 18:13











  • Wiktor, wielkie dzięki, if I have guessed ;)

    – Sergey Alikin
    Nov 21 '18 at 18:14
















2















I know that this hackneyed theme and I read related answers...

However, I will ask...

I have input string in next format: 



3#0.01, 2#0.5, 1#-10, -2#~


So this is a list of values splitted by comma.

I can catch all values with next expression: 



(([-+]?d+)#([-+]?d*.?d+|~))+


It's working fine.



But I want to have no matching if any mistake is presenting in input string, for example: 



MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO


Unfortunately ^ and $ symbols are not helping here.

So my question: how can I stop matching if some part of input string is invalid.

Thanks.



Here is snippet: https://regex101.com/r/Xih0Qk/2






.net regex lookahead lookbehind







share|improve this question

























  • Try (([-+]?bd+)#([-+]?d*.?d+|~B))+

    – Wiktor Stribiżew
    Nov 21 '18 at 17:13











  • Wiktor, thanks for your attempt. But, unfortunately, no.

    – Sergey Alikin
    Nov 21 '18 at 17:49











  • So, you want to match them all only after validating the whole string? Something like regex101.com/r/Xih0Qk/3?

    – Wiktor Stribiżew
    Nov 21 '18 at 17:59











  • Wiktor, that's exactly what I want.

    – Sergey Alikin
    Nov 21 '18 at 18:13











  • Wiktor, wielkie dzięki, if I have guessed ;)

    – Sergey Alikin
    Nov 21 '18 at 18:14














2












2








2








I know that this hackneyed theme and I read related answers...

However, I will ask...

I have input string in next format: 



3#0.01, 2#0.5, 1#-10, -2#~


So this is a list of values splitted by comma.

I can catch all values with next expression: 



(([-+]?d+)#([-+]?d*.?d+|~))+


It's working fine.



But I want to have no matching if any mistake is presenting in input string, for example: 



MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO


Unfortunately ^ and $ symbols are not helping here.

So my question: how can I stop matching if some part of input string is invalid.

Thanks.



Here is snippet: https://regex101.com/r/Xih0Qk/2






.net regex lookahead lookbehind







share|improve this question
















I know that this hackneyed theme and I read related answers...

However, I will ask...

I have input string in next format: 



3#0.01, 2#0.5, 1#-10, -2#~


So this is a list of values splitted by comma.

I can catch all values with next expression: 



(([-+]?d+)#([-+]?d*.?d+|~))+


It's working fine.



But I want to have no matching if any mistake is presenting in input string, for example: 



MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO


Unfortunately ^ and $ symbols are not helping here.

So my question: how can I stop matching if some part of input string is invalid.

Thanks.



Here is snippet: https://regex101.com/r/Xih0Qk/2






.net regex lookahead lookbehind




.net regex lookahead lookbehind






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 21 '18 at 18:52









Poul Bak

5,46831232




5,46831232










asked Nov 21 '18 at 17:12









Sergey AlikinSergey Alikin

305




305













  • Try (([-+]?bd+)#([-+]?d*.?d+|~B))+

    – Wiktor Stribiżew
    Nov 21 '18 at 17:13











  • Wiktor, thanks for your attempt. But, unfortunately, no.

    – Sergey Alikin
    Nov 21 '18 at 17:49











  • So, you want to match them all only after validating the whole string? Something like regex101.com/r/Xih0Qk/3?

    – Wiktor Stribiżew
    Nov 21 '18 at 17:59











  • Wiktor, that's exactly what I want.

    – Sergey Alikin
    Nov 21 '18 at 18:13











  • Wiktor, wielkie dzięki, if I have guessed ;)

    – Sergey Alikin
    Nov 21 '18 at 18:14



















  • Try (([-+]?bd+)#([-+]?d*.?d+|~B))+

    – Wiktor Stribiżew
    Nov 21 '18 at 17:13











  • Wiktor, thanks for your attempt. But, unfortunately, no.

    – Sergey Alikin
    Nov 21 '18 at 17:49











  • So, you want to match them all only after validating the whole string? Something like regex101.com/r/Xih0Qk/3?

    – Wiktor Stribiżew
    Nov 21 '18 at 17:59











  • Wiktor, that's exactly what I want.

    – Sergey Alikin
    Nov 21 '18 at 18:13











  • Wiktor, wielkie dzięki, if I have guessed ;)

    – Sergey Alikin
    Nov 21 '18 at 18:14

















Try (([-+]?bd+)#([-+]?d*.?d+|~B))+

– Wiktor Stribiżew
Nov 21 '18 at 17:13





Try (([-+]?bd+)#([-+]?d*.?d+|~B))+

– Wiktor Stribiżew
Nov 21 '18 at 17:13













Wiktor, thanks for your attempt. But, unfortunately, no.

– Sergey Alikin
Nov 21 '18 at 17:49





Wiktor, thanks for your attempt. But, unfortunately, no.

– Sergey Alikin
Nov 21 '18 at 17:49













So, you want to match them all only after validating the whole string? Something like regex101.com/r/Xih0Qk/3?

– Wiktor Stribiżew
Nov 21 '18 at 17:59





So, you want to match them all only after validating the whole string? Something like regex101.com/r/Xih0Qk/3?

– Wiktor Stribiżew
Nov 21 '18 at 17:59













Wiktor, that's exactly what I want.

– Sergey Alikin
Nov 21 '18 at 18:13





Wiktor, that's exactly what I want.

– Sergey Alikin
Nov 21 '18 at 18:13













Wiktor, wielkie dzięki, if I have guessed ;)

– Sergey Alikin
Nov 21 '18 at 18:14





Wiktor, wielkie dzięki, if I have guessed ;)

– Sergey Alikin
Nov 21 '18 at 18:14












1 Answer
1






active

oldest

votes


















2














In .NET, you may use a regex with inifinite width lookbehinds (it is also supported in the latest ECMAScript 2018 powered JavaScript environments, if you need to port the same solution there). The regex will look like



(?<=^(?:[-+]?d+#(?:[-+]?d*.?d+|~),s)*)[-+]?d+#(?:[-+]?d*.?d+|~)(?=(?:,s[-+]?d+#(?:[-+]?d*.?d+|~))*$)


See the online regex demo



In code, it is easier to build the pattern from a variable:



var block = @"[-+]?d+#(?:[-+]?d*.?d+|~)";   // Block/unit pattern

var pattern = $@"(?<=^(?:{block},s)*){block}(?=(?:,s{block})*$)";

var results1 = Regex.Matches("3#0.01, 2#0.5, 1#-10, -2#~", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results1.Count() > 0)

    Console.WriteLine(string.Join(", ", results1));

var results2 = Regex.Matches("MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results2.Count() > 0)

    Console.WriteLine(string.Join(", ", results2));


See the C# demo online. Output (only the right string matched):



3#0.01, 2#0.5, 1#-10, -2#~


Pattern explanation





  • (?<=^(?:{block},s)*) - a positive lookbehind that only matches a location immediately preceded with 0+ occurrences of a {block} pattern at the start of the string followed with a , and 1 whitespace


  • {block} - your block/unit pattern to match


  • (?=(?:,s{block})*$) - a positive lookahead that matches a location immediately followed with 0+ occurrences of a ,, a whitespace and a {block} pattern up to the end of the string.






share|improve this answer
























  • Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

    – Sergey Alikin
    Nov 21 '18 at 19:00











  • @SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

    – Wiktor Stribiżew
    Nov 21 '18 at 19:05











  • Wiktor, thank you very very much. I will not disturb you more.

    – Sergey Alikin
    Nov 21 '18 at 19:17











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














In .NET, you may use a regex with inifinite width lookbehinds (it is also supported in the latest ECMAScript 2018 powered JavaScript environments, if you need to port the same solution there). The regex will look like



(?<=^(?:[-+]?d+#(?:[-+]?d*.?d+|~),s)*)[-+]?d+#(?:[-+]?d*.?d+|~)(?=(?:,s[-+]?d+#(?:[-+]?d*.?d+|~))*$)


See the online regex demo



In code, it is easier to build the pattern from a variable:



var block = @"[-+]?d+#(?:[-+]?d*.?d+|~)";   // Block/unit pattern

var pattern = $@"(?<=^(?:{block},s)*){block}(?=(?:,s{block})*$)";

var results1 = Regex.Matches("3#0.01, 2#0.5, 1#-10, -2#~", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results1.Count() > 0)

    Console.WriteLine(string.Join(", ", results1));

var results2 = Regex.Matches("MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results2.Count() > 0)

    Console.WriteLine(string.Join(", ", results2));


See the C# demo online. Output (only the right string matched):



3#0.01, 2#0.5, 1#-10, -2#~


Pattern explanation





  • (?<=^(?:{block},s)*) - a positive lookbehind that only matches a location immediately preceded with 0+ occurrences of a {block} pattern at the start of the string followed with a , and 1 whitespace


  • {block} - your block/unit pattern to match


  • (?=(?:,s{block})*$) - a positive lookahead that matches a location immediately followed with 0+ occurrences of a ,, a whitespace and a {block} pattern up to the end of the string.






share|improve this answer
























  • Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

    – Sergey Alikin
    Nov 21 '18 at 19:00











  • @SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

    – Wiktor Stribiżew
    Nov 21 '18 at 19:05











  • Wiktor, thank you very very much. I will not disturb you more.

    – Sergey Alikin
    Nov 21 '18 at 19:17
















2














In .NET, you may use a regex with inifinite width lookbehinds (it is also supported in the latest ECMAScript 2018 powered JavaScript environments, if you need to port the same solution there). The regex will look like



(?<=^(?:[-+]?d+#(?:[-+]?d*.?d+|~),s)*)[-+]?d+#(?:[-+]?d*.?d+|~)(?=(?:,s[-+]?d+#(?:[-+]?d*.?d+|~))*$)


See the online regex demo



In code, it is easier to build the pattern from a variable:



var block = @"[-+]?d+#(?:[-+]?d*.?d+|~)";   // Block/unit pattern

var pattern = $@"(?<=^(?:{block},s)*){block}(?=(?:,s{block})*$)";

var results1 = Regex.Matches("3#0.01, 2#0.5, 1#-10, -2#~", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results1.Count() > 0)

    Console.WriteLine(string.Join(", ", results1));

var results2 = Regex.Matches("MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results2.Count() > 0)

    Console.WriteLine(string.Join(", ", results2));


See the C# demo online. Output (only the right string matched):



3#0.01, 2#0.5, 1#-10, -2#~


Pattern explanation





  • (?<=^(?:{block},s)*) - a positive lookbehind that only matches a location immediately preceded with 0+ occurrences of a {block} pattern at the start of the string followed with a , and 1 whitespace


  • {block} - your block/unit pattern to match


  • (?=(?:,s{block})*$) - a positive lookahead that matches a location immediately followed with 0+ occurrences of a ,, a whitespace and a {block} pattern up to the end of the string.






share|improve this answer
























  • Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

    – Sergey Alikin
    Nov 21 '18 at 19:00











  • @SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

    – Wiktor Stribiżew
    Nov 21 '18 at 19:05











  • Wiktor, thank you very very much. I will not disturb you more.

    – Sergey Alikin
    Nov 21 '18 at 19:17














2












2








2







In .NET, you may use a regex with inifinite width lookbehinds (it is also supported in the latest ECMAScript 2018 powered JavaScript environments, if you need to port the same solution there). The regex will look like



(?<=^(?:[-+]?d+#(?:[-+]?d*.?d+|~),s)*)[-+]?d+#(?:[-+]?d*.?d+|~)(?=(?:,s[-+]?d+#(?:[-+]?d*.?d+|~))*$)


See the online regex demo



In code, it is easier to build the pattern from a variable:



var block = @"[-+]?d+#(?:[-+]?d*.?d+|~)";   // Block/unit pattern

var pattern = $@"(?<=^(?:{block},s)*){block}(?=(?:,s{block})*$)";

var results1 = Regex.Matches("3#0.01, 2#0.5, 1#-10, -2#~", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results1.Count() > 0)

    Console.WriteLine(string.Join(", ", results1));

var results2 = Regex.Matches("MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results2.Count() > 0)

    Console.WriteLine(string.Join(", ", results2));


See the C# demo online. Output (only the right string matched):



3#0.01, 2#0.5, 1#-10, -2#~


Pattern explanation





  • (?<=^(?:{block},s)*) - a positive lookbehind that only matches a location immediately preceded with 0+ occurrences of a {block} pattern at the start of the string followed with a , and 1 whitespace


  • {block} - your block/unit pattern to match


  • (?=(?:,s{block})*$) - a positive lookahead that matches a location immediately followed with 0+ occurrences of a ,, a whitespace and a {block} pattern up to the end of the string.






share|improve this answer













In .NET, you may use a regex with inifinite width lookbehinds (it is also supported in the latest ECMAScript 2018 powered JavaScript environments, if you need to port the same solution there). The regex will look like



(?<=^(?:[-+]?d+#(?:[-+]?d*.?d+|~),s)*)[-+]?d+#(?:[-+]?d*.?d+|~)(?=(?:,s[-+]?d+#(?:[-+]?d*.?d+|~))*$)


See the online regex demo



In code, it is easier to build the pattern from a variable:



var block = @"[-+]?d+#(?:[-+]?d*.?d+|~)";   // Block/unit pattern

var pattern = $@"(?<=^(?:{block},s)*){block}(?=(?:,s{block})*$)";

var results1 = Regex.Matches("3#0.01, 2#0.5, 1#-10, -2#~", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results1.Count() > 0)

    Console.WriteLine(string.Join(", ", results1));

var results2 = Regex.Matches("MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO", pattern)

    .Cast<Match>().Select(x => x.Value);

if (results2.Count() > 0)

    Console.WriteLine(string.Join(", ", results2));


See the C# demo online. Output (only the right string matched):



3#0.01, 2#0.5, 1#-10, -2#~


Pattern explanation





  • (?<=^(?:{block},s)*) - a positive lookbehind that only matches a location immediately preceded with 0+ occurrences of a {block} pattern at the start of the string followed with a , and 1 whitespace


  • {block} - your block/unit pattern to match


  • (?=(?:,s{block})*$) - a positive lookahead that matches a location immediately followed with 0+ occurrences of a ,, a whitespace and a {block} pattern up to the end of the string.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 21 '18 at 18:48









Wiktor StribiżewWiktor Stribiżew

315k16133213




315k16133213













  • Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

    – Sergey Alikin
    Nov 21 '18 at 19:00











  • @SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

    – Wiktor Stribiżew
    Nov 21 '18 at 19:05











  • Wiktor, thank you very very much. I will not disturb you more.

    – Sergey Alikin
    Nov 21 '18 at 19:17



















  • Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

    – Sergey Alikin
    Nov 21 '18 at 19:00











  • @SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

    – Wiktor Stribiżew
    Nov 21 '18 at 19:05











  • Wiktor, thank you very very much. I will not disturb you more.

    – Sergey Alikin
    Nov 21 '18 at 19:17

















Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

– Sergey Alikin
Nov 21 '18 at 19:00





Wiktor, thanks! You are the best. Can I ask about small detail: how can I match only WRONG patterns. MISTAKE3#0.01, 2#0.5, 1#-10, -2#~AND_HERE_MISTAKE_TOO. First and last in this line, for example.

– Sergey Alikin
Nov 21 '18 at 19:00













@SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

– Wiktor Stribiżew
Nov 21 '18 at 19:05





@SergeyAlikin Probably, if you remove all the valid ones, Regex.Replace(s, @"(?:^|,s)[-+]?d+#(?:[-+]?d*.?d+|~)(?=,s|$)", "").Split(new {", "}, StringSplitOptions.None)

– Wiktor Stribiżew
Nov 21 '18 at 19:05













Wiktor, thank you very very much. I will not disturb you more.

– Sergey Alikin
Nov 21 '18 at 19:17





Wiktor, thank you very very much. I will not disturb you more.

– Sergey Alikin
Nov 21 '18 at 19:17


















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"Incorrect syntax near the keyword 'ON'. (on update cascade, on delete cascade,)

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box; } 2 total noob sorry any help greatly appreciated. I keep getting this "Incorrect syntax near the keyword 'ON'." heres my codes code one CREATE TABLE supplier ( supplierID INT PRIMARY KEY, ISBN INT FOREIGN KEY REFERENCES book(ISBN), price DECIMAL (5,2), ON UPDATE CASCADE, ON DELETE CASCADE, ); code two CREATE TABLE orders ( orderID INT PRIMARY KEY, customerID INT FOREIGN KEY REFERENCES customer(customerID), ISBN INT FOREIGN KEY REFERENCES book(ISBN), orderDate date, ON UPDATE CASCADE, ON DELETE CASCADE, ); Ive run out of stuff to try other than dumbing it down to uselessness. ...
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Alcedinidae

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Alcedinidae Martin-pêcheur à dos bleu ( Alcedo azurea ) Classification (COI) Règne Animalia Embranchement Chordata Sous-embr. Vertebrata Classe Aves Ordre Coraciiformes Famille Alcedinidae Rafinesque, 1815 Les Alcédinidés ou Alcedinidae forment une famille d'oiseaux plus connus sous les noms de martins-pêcheurs et martins-chasseurs. Sommaire 1 Description 2 Répartition et habitat 3 Systématique 3.1 Liste alphabétique des genres 3.2 Liste des espèces 4 Chez les Anciens : l'alcyon 4.1 Étymologie (Littré) 4.2 Oiseau « fabuleux » ? 5 Notes 6 Articles connexes 7 Liens externes 7.1 Bibliographie Description | Ce sont des oiseaux compacts de taille petite à moyenne (10 à 46 cm), au bec droit et long, en forme de poignard. Leurs pattes sont courtes, et ils portent un plumage aux couleurs vives. Répartition et habitat | Cosmopolites, ils fréquentent surtout ...
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Origin of the phrase “under your belt”?

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0; } 17 1 Today, I found myself discussing what students should have "under their belts" during a lecture, and I wondered to myself if there was some inappropriate undertone here that I might be unaware of. Question : What is the origin of the phrase "under your belt"? A google search revealed some webpages (e.g. [1]) that assert its origin is related to consumption of food -- once a meal has been eaten, it's under your belt (which is a relief). However, with such websites, I have no way to determine fact from "random guy on the internet making stuff up". etymology idioms ...
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