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How to match only strings that do not contain a dot (using regular expressions)

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

18

4

I'm trying to find a regexp that only matches strings if they don't contain a dot, e.g. it matches stackoverflow, 42abc47 or a-bc-31_4 but doesn't match: .swp, stackoverflow or test..

regex

share|improve this question

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  By the way, you should update the question to accurately reflect what you want. You seem to not want does but the question indicates you do want dots.
  
  – Tom
  Jan 20 '11 at 0:45
  

  
  
  
  

add a comment
 | 

18

4

I'm trying to find a regexp that only matches strings if they don't contain a dot, e.g. it matches stackoverflow, 42abc47 or a-bc-31_4 but doesn't match: .swp, stackoverflow or test..

regex

share|improve this question

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  By the way, you should update the question to accurately reflect what you want. You seem to not want does but the question indicates you do want dots.
  
  – Tom
  Jan 20 '11 at 0:45
  

  
  
  
  

add a comment
 | 

I'm trying to find a regexp that only matches strings if they don't contain a dot, e.g. it matches stackoverflow, 42abc47 or a-bc-31_4 but doesn't match: .swp, stackoverflow or test..

regex

share|improve this question

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

share|improve this question

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

share|improve this question

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

edited Nov 20 '16 at 8:44

Martin Vseticka

18.2k2020 gold badges102102 silver badges176176 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

asked Jan 20 '11 at 0:38

tx31415tx31415

9311 gold badge11 silver badge44 bronze badges

3 Answers
3

active

oldest

votes

35

^[^.]*$

or

^[^.]+$

Depending on whether you want to match empty string. Some applications may implicitly supply the ^ and $, in which case they'd be unnecessary. For example: the HTML5 input element's pattern attribute.

You can find a lot more great information on the regular-expressions.info site.

share|improve this answer

edited Jan 20 '11 at 2:19

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks, this worked!
  
  – tx31415
  Jan 20 '11 at 1:52
  

  
  
  
  

add a comment
 | 

4

Use a regex that doesn't have any dots:

^[^.]*$

That is zero or more characters that are not dots in the whole string. Some regex libraries I have used in the past had ways of getting an exact match. In that case you don't need the ^ and $. Having a language in your question would help.

By the way, you don't have to use a regex. In java you could say:

!someString.contains(".");

share|improve this answer

edited Jan 20 '11 at 1:20

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @tchrist - I updated my answer. I really have used libraries before (can't remember which though) that allow for exact matching. I figured the OP was having trouble with saying "not dot". Also -- I think my contains approach is pretty reasonable. But perhaps this is homework or the OP is forced to use some library that only accepts a regex...
  
  – Tom
  Jan 20 '11 at 1:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I will add: my solution works for most languages, but there can be subtleties and I'm happy to try and clarify if the OP provides more details. Also, escaping in brackets is fine (in languages I have used) and I prefer to do it.
  
  – Tom
  Jan 20 '11 at 1:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tom: I agree that a substring check instead of regex is a perfectly reasonable approach; the question sounds like homework or somehow in over their head. What you’re remembering is that Java has a screwed up matches method (don't get me started), which goes out of its way to supply anchors even when you don’t; that's just one of several reasons why you should only use its find method if you’re forced to use Java for regexes (it’s not very good at them). Most other regex languages aren't so lame. BTW, you still have a spurious backslash. Remove it and I'll remove my downvote.
  
  – tchrist
  Jan 20 '11 at 1:14
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @tchrist: removed... but really? It does work. And matches is not what I'm thinking of. Now that I think of it, it was either a third party library or a utility function I wrote for myself.
  
  – Tom
  Jan 20 '11 at 1:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tom I don’t like to see the extra backslashes in square-bracketed character classes because it risks people thinking that . and . mean something different within them — and from there they’ll likely misextrapolate other dubious inaccuracies. It’s important that they realize things work differently inside the brackets than they work outside them.
  
  – tchrist
  Jan 20 '11 at 1:25
  
  

  
  
  
  

 | 
show 1 more comment

1

Validation Require: First Character must be Letter and then Dot '.' is not allowed in Target String.

// The input string we are using
string input = "1A_aaA";

 // The regular expression we use to match
 Regex r1 = new Regex("^[A-Za-z][^.]*$"); //[tx0020] tab and spaces.

 // Match the input and write results
 Match match = r1.Match(input);
 if (match.Success)
 
 Console.WriteLine("Valid: 0", match.Value);

 
 else
 
 Console.WriteLine("Not Match");
 

share|improve this answer

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges

add a comment
 | 

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35

^[^.]*$

or

^[^.]+$

Depending on whether you want to match empty string. Some applications may implicitly supply the ^ and $, in which case they'd be unnecessary. For example: the HTML5 input element's pattern attribute.

You can find a lot more great information on the regular-expressions.info site.

share|improve this answer

edited Jan 20 '11 at 2:19

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks, this worked!
  
  – tx31415
  Jan 20 '11 at 1:52
  

  
  
  
  

add a comment
 | 

35

^[^.]*$

or

^[^.]+$

Depending on whether you want to match empty string. Some applications may implicitly supply the ^ and $, in which case they'd be unnecessary. For example: the HTML5 input element's pattern attribute.

You can find a lot more great information on the regular-expressions.info site.

share|improve this answer

edited Jan 20 '11 at 2:19

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks, this worked!
  
  – tx31415
  Jan 20 '11 at 1:52
  

  
  
  
  

add a comment
 | 

^[^.]*$

or

^[^.]+$

Depending on whether you want to match empty string. Some applications may implicitly supply the ^ and $, in which case they'd be unnecessary. For example: the HTML5 input element's pattern attribute.

You can find a lot more great information on the regular-expressions.info site.

share|improve this answer

edited Jan 20 '11 at 2:19

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

^[^.]*$

^[^.]+$

share|improve this answer

edited Jan 20 '11 at 2:19

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

answered Jan 20 '11 at 0:41

Bob AmanBob Aman

29.4k99 gold badges6060 silver badges9494 bronze badges

4

Use a regex that doesn't have any dots:

^[^.]*$

That is zero or more characters that are not dots in the whole string. Some regex libraries I have used in the past had ways of getting an exact match. In that case you don't need the ^ and $. Having a language in your question would help.

By the way, you don't have to use a regex. In java you could say:

!someString.contains(".");

share|improve this answer

edited Jan 20 '11 at 1:20

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @tchrist - I updated my answer. I really have used libraries before (can't remember which though) that allow for exact matching. I figured the OP was having trouble with saying "not dot". Also -- I think my contains approach is pretty reasonable. But perhaps this is homework or the OP is forced to use some library that only accepts a regex...
  
  – Tom
  Jan 20 '11 at 1:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I will add: my solution works for most languages, but there can be subtleties and I'm happy to try and clarify if the OP provides more details. Also, escaping in brackets is fine (in languages I have used) and I prefer to do it.
  
  – Tom
  Jan 20 '11 at 1:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tom: I agree that a substring check instead of regex is a perfectly reasonable approach; the question sounds like homework or somehow in over their head. What you’re remembering is that Java has a screwed up matches method (don't get me started), which goes out of its way to supply anchors even when you don’t; that's just one of several reasons why you should only use its find method if you’re forced to use Java for regexes (it’s not very good at them). Most other regex languages aren't so lame. BTW, you still have a spurious backslash. Remove it and I'll remove my downvote.
  
  – tchrist
  Jan 20 '11 at 1:14
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @tchrist: removed... but really? It does work. And matches is not what I'm thinking of. Now that I think of it, it was either a third party library or a utility function I wrote for myself.
  
  – Tom
  Jan 20 '11 at 1:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tom I don’t like to see the extra backslashes in square-bracketed character classes because it risks people thinking that . and . mean something different within them — and from there they’ll likely misextrapolate other dubious inaccuracies. It’s important that they realize things work differently inside the brackets than they work outside them.
  
  – tchrist
  Jan 20 '11 at 1:25
  
  

  
  
  
  

 | 
show 1 more comment

4

Use a regex that doesn't have any dots:

^[^.]*$

That is zero or more characters that are not dots in the whole string. Some regex libraries I have used in the past had ways of getting an exact match. In that case you don't need the ^ and $. Having a language in your question would help.

By the way, you don't have to use a regex. In java you could say:

!someString.contains(".");

share|improve this answer

edited Jan 20 '11 at 1:20

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @tchrist - I updated my answer. I really have used libraries before (can't remember which though) that allow for exact matching. I figured the OP was having trouble with saying "not dot". Also -- I think my contains approach is pretty reasonable. But perhaps this is homework or the OP is forced to use some library that only accepts a regex...
  
  – Tom
  Jan 20 '11 at 1:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I will add: my solution works for most languages, but there can be subtleties and I'm happy to try and clarify if the OP provides more details. Also, escaping in brackets is fine (in languages I have used) and I prefer to do it.
  
  – Tom
  Jan 20 '11 at 1:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tom: I agree that a substring check instead of regex is a perfectly reasonable approach; the question sounds like homework or somehow in over their head. What you’re remembering is that Java has a screwed up matches method (don't get me started), which goes out of its way to supply anchors even when you don’t; that's just one of several reasons why you should only use its find method if you’re forced to use Java for regexes (it’s not very good at them). Most other regex languages aren't so lame. BTW, you still have a spurious backslash. Remove it and I'll remove my downvote.
  
  – tchrist
  Jan 20 '11 at 1:14
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @tchrist: removed... but really? It does work. And matches is not what I'm thinking of. Now that I think of it, it was either a third party library or a utility function I wrote for myself.
  
  – Tom
  Jan 20 '11 at 1:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tom I don’t like to see the extra backslashes in square-bracketed character classes because it risks people thinking that . and . mean something different within them — and from there they’ll likely misextrapolate other dubious inaccuracies. It’s important that they realize things work differently inside the brackets than they work outside them.
  
  – tchrist
  Jan 20 '11 at 1:25
  
  

  
  
  
  

 | 
show 1 more comment

Use a regex that doesn't have any dots:

^[^.]*$

That is zero or more characters that are not dots in the whole string. Some regex libraries I have used in the past had ways of getting an exact match. In that case you don't need the ^ and $. Having a language in your question would help.

By the way, you don't have to use a regex. In java you could say:

!someString.contains(".");

share|improve this answer

edited Jan 20 '11 at 1:20

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

^[^.]*$

!someString.contains(".");

share|improve this answer

edited Jan 20 '11 at 1:20

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

answered Jan 20 '11 at 0:41

TomTom

15.8k55 gold badges3434 silver badges4343 bronze badges

1

Validation Require: First Character must be Letter and then Dot '.' is not allowed in Target String.

// The input string we are using
string input = "1A_aaA";

 // The regular expression we use to match
 Regex r1 = new Regex("^[A-Za-z][^.]*$"); //[tx0020] tab and spaces.

 // Match the input and write results
 Match match = r1.Match(input);
 if (match.Success)
 
 Console.WriteLine("Valid: 0", match.Value);

 
 else
 
 Console.WriteLine("Not Match");
 

share|improve this answer

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges

add a comment
 | 

1

Validation Require: First Character must be Letter and then Dot '.' is not allowed in Target String.

// The input string we are using
string input = "1A_aaA";

 // The regular expression we use to match
 Regex r1 = new Regex("^[A-Za-z][^.]*$"); //[tx0020] tab and spaces.

 // Match the input and write results
 Match match = r1.Match(input);
 if (match.Success)
 
 Console.WriteLine("Valid: 0", match.Value);

 
 else
 
 Console.WriteLine("Not Match");
 

share|improve this answer

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges

add a comment
 | 

Validation Require: First Character must be Letter and then Dot '.' is not allowed in Target String.

// The input string we are using
string input = "1A_aaA";

 // The regular expression we use to match
 Regex r1 = new Regex("^[A-Za-z][^.]*$"); //[tx0020] tab and spaces.

 // Match the input and write results
 Match match = r1.Match(input);
 if (match.Success)
 
 Console.WriteLine("Valid: 0", match.Value);

 
 else
 
 Console.WriteLine("Not Match");
 

share|improve this answer

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges

 // The regular expression we use to match
 Regex r1 = new Regex("^[A-Za-z][^.]*$"); //[tx0020] tab and spaces.

 // Match the input and write results
 Match match = r1.Match(input);
 if (match.Success)
 
 Console.WriteLine("Valid: 0", match.Value);

 
 else
 
 Console.WriteLine("Not Match");
 

share|improve this answer

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges

answered Feb 22 '12 at 11:54

Muhammad MubashirMuhammad Mubashir

1,14311 gold badge1717 silver badges1717 bronze badges