Mixing
Check empty and digit input with regex at same time in MVC
First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!
[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]
public string FirstName { get; set; }
asp.net regex
edited Nov 20 '18 at 7:54
Foo
1
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
|
show 5 more comments
First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!
[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]
public string FirstName { get; set; }
asp.net regex
edited Nov 20 '18 at 7:54
Foo
1
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
1
What is environment you are working in? programming language, web framework?
– Fabio
Nov 19 '18 at 23:22
1
Regexps cannot detectnullvalues. They only work with strings. You might have meant empty string.
– Wiktor Stribiżew
Nov 19 '18 at 23:25
@NRitH I already removed that tag
– Nick
Nov 20 '18 at 2:55
@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?
– Asif Shakir
Nov 20 '18 at 7:15
@Fabio please check i have edit the code for more clear understanding .
– Asif Shakir
Nov 20 '18 at 7:24
|
show 5 more comments
First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!
[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]
public string FirstName { get; set; }
asp.net regex
edited Nov 20 '18 at 7:54
Foo
1
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!
[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]
public string FirstName { get; set; }
asp.net regex
asp.net regex
edited Nov 20 '18 at 7:54
Foo
1
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
edited Nov 20 '18 at 7:54
Foo
1
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
edited Nov 20 '18 at 7:54
Foo
1
edited Nov 20 '18 at 7:54
Foo
1
edited Nov 20 '18 at 7:54
Foo
1
1
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
asked Nov 19 '18 at 23:20
Asif ShakirAsif Shakir
169
169
1
What is environment you are working in? programming language, web framework?
– Fabio
Nov 19 '18 at 23:22
1
Regexps cannot detectnullvalues. They only work with strings. You might have meant empty string.
– Wiktor Stribiżew
Nov 19 '18 at 23:25
@NRitH I already removed that tag
– Nick
Nov 20 '18 at 2:55
@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?
– Asif Shakir
Nov 20 '18 at 7:15
@Fabio please check i have edit the code for more clear understanding .
– Asif Shakir
Nov 20 '18 at 7:24
|
show 5 more comments
1
What is environment you are working in? programming language, web framework?
– Fabio
Nov 19 '18 at 23:22
1
Regexps cannot detectnullvalues. They only work with strings. You might have meant empty string.
– Wiktor Stribiżew
Nov 19 '18 at 23:25
@NRitH I already removed that tag
– Nick
Nov 20 '18 at 2:55
@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?
– Asif Shakir
Nov 20 '18 at 7:15
@Fabio please check i have edit the code for more clear understanding .
– Asif Shakir
Nov 20 '18 at 7:24
1
1
What is environment you are working in? programming language, web framework?
– Fabio
Nov 19 '18 at 23:22
What is environment you are working in? programming language, web framework?
– Fabio
Nov 19 '18 at 23:22
1
1
Regexps cannot detect
null values. They only work with strings. You might have meant empty string.– Wiktor Stribiżew
Nov 19 '18 at 23:25
Regexps cannot detect
null values. They only work with strings. You might have meant empty string.– Wiktor Stribiżew
Nov 19 '18 at 23:25
@NRitH I already removed that tag
– Nick
Nov 20 '18 at 2:55
@NRitH I already removed that tag
– Nick
Nov 20 '18 at 2:55
@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?
– Asif Shakir
Nov 20 '18 at 7:15
@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?
– Asif Shakir
Nov 20 '18 at 7:15
@Fabio please check i have edit the code for more clear understanding .
– Asif Shakir
Nov 20 '18 at 7:24
@Fabio please check i have edit the code for more clear understanding .
– Asif Shakir
Nov 20 '18 at 7:24
|
show 5 more comments
3 Answers
3
active
oldest
votes
^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:
console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));answered Nov 20 '18 at 2:54
NickNick
25.1k91735
add a comment |
Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.
I suggest
[RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
public string FirstName { get; set; }
The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
Your pattern does not work- I think it works but in another way: Match with this pattern
– Foo
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@AsifShakir If you need to show error if the input is empty, use[Required]. There is no reason for you to want to avoid it.
– Wiktor Stribiżew
Nov 20 '18 at 7:58
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
|
show 1 more comment
[Required(ErrorMessage = "{0} cannot be empty")]
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
[Display(Name = "First name")]
public string FirstName { get; set; }
Error message if the input is empty:
First name cannot be empty
and if the input value contains non alphabet character(s):
First name must have Alphabets only
If you want to allow empty value, you could try:
[RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]
(^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).
answered Nov 20 '18 at 8:00
FooFoo
1
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
@AsifShakir In that case, you just need[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message:First name is not valid.
– Foo
Nov 20 '18 at 8:47
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:
console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));answered Nov 20 '18 at 2:54
NickNick
25.1k91735
add a comment |
^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:
console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));answered Nov 20 '18 at 2:54
NickNick
25.1k91735
add a comment |
^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:
console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));answered Nov 20 '18 at 2:54
NickNick
25.1k91735
^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:
console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));console.log(/^d*$/.test(''));
console.log(/^d*$/.test('123'));
console.log(/^d*$/.test('x1'));
console.log(/D/.test(''));
console.log(/D/.test('123'));
console.log(/D/.test('x1'));answered Nov 20 '18 at 2:54
NickNick
25.1k91735
answered Nov 20 '18 at 2:54
NickNick
25.1k91735
answered Nov 20 '18 at 2:54
NickNick
25.1k91735
answered Nov 20 '18 at 2:54
NickNick
25.1k91735
25.1k91735
add a comment |
add a comment |
Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.
I suggest
[RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
public string FirstName { get; set; }
The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
Your pattern does not work- I think it works but in another way: Match with this pattern
– Foo
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@AsifShakir If you need to show error if the input is empty, use[Required]. There is no reason for you to want to avoid it.
– Wiktor Stribiżew
Nov 20 '18 at 7:58
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
|
show 1 more comment
Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.
I suggest
[RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
public string FirstName { get; set; }
The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
Your pattern does not work- I think it works but in another way: Match with this pattern
– Foo
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@AsifShakir If you need to show error if the input is empty, use[Required]. There is no reason for you to want to avoid it.
– Wiktor Stribiżew
Nov 20 '18 at 7:58
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
|
show 1 more comment
Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.
I suggest
[RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
public string FirstName { get; set; }
The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.
I suggest
[RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
public string FirstName { get; set; }
The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
edited Nov 20 '18 at 7:52
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
answered Nov 20 '18 at 7:47
Wiktor StribiżewWiktor Stribiżew
310k16131206
310k16131206
Your pattern does not work- I think it works but in another way: Match with this pattern
– Foo
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@AsifShakir If you need to show error if the input is empty, use[Required]. There is no reason for you to want to avoid it.
– Wiktor Stribiżew
Nov 20 '18 at 7:58
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
|
show 1 more comment
Your pattern does not work- I think it works but in another way: Match with this pattern
– Foo
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@AsifShakir If you need to show error if the input is empty, use[Required]. There is no reason for you to want to avoid it.
– Wiktor Stribiżew
Nov 20 '18 at 7:58
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
Your pattern does not work - I think it works but in another way: Match with this pattern– Foo
Nov 20 '18 at 7:52
Your pattern does not work - I think it works but in another way: Match with this pattern– Foo
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.
– Wiktor Stribiżew
Nov 20 '18 at 7:52
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?
– Asif Shakir
Nov 20 '18 at 7:57
@AsifShakir If you need to show error if the input is empty, use
[Required]. There is no reason for you to want to avoid it.– Wiktor Stribiżew
Nov 20 '18 at 7:58
@AsifShakir If you need to show error if the input is empty, use
[Required]. There is no reason for you to want to avoid it.– Wiktor Stribiżew
Nov 20 '18 at 7:58
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
@WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?
– Asif Shakir
Nov 20 '18 at 8:00
|
show 1 more comment
[Required(ErrorMessage = "{0} cannot be empty")]
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
[Display(Name = "First name")]
public string FirstName { get; set; }
Error message if the input is empty:
First name cannot be empty
and if the input value contains non alphabet character(s):
First name must have Alphabets only
If you want to allow empty value, you could try:
[RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]
(^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).
answered Nov 20 '18 at 8:00
FooFoo
1
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
@AsifShakir In that case, you just need[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message:First name is not valid.
– Foo
Nov 20 '18 at 8:47
add a comment |
[Required(ErrorMessage = "{0} cannot be empty")]
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
[Display(Name = "First name")]
public string FirstName { get; set; }
Error message if the input is empty:
First name cannot be empty
and if the input value contains non alphabet character(s):
First name must have Alphabets only
If you want to allow empty value, you could try:
[RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]
(^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).
answered Nov 20 '18 at 8:00
FooFoo
1
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
@AsifShakir In that case, you just need[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message:First name is not valid.
– Foo
Nov 20 '18 at 8:47
add a comment |
[Required(ErrorMessage = "{0} cannot be empty")]
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
[Display(Name = "First name")]
public string FirstName { get; set; }
Error message if the input is empty:
First name cannot be empty
and if the input value contains non alphabet character(s):
First name must have Alphabets only
If you want to allow empty value, you could try:
[RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]
(^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).
answered Nov 20 '18 at 8:00
FooFoo
1
[Required(ErrorMessage = "{0} cannot be empty")]
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
[Display(Name = "First name")]
public string FirstName { get; set; }
Error message if the input is empty:
First name cannot be empty
and if the input value contains non alphabet character(s):
First name must have Alphabets only
If you want to allow empty value, you could try:
[RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]
(^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).
answered Nov 20 '18 at 8:00
FooFoo
1
answered Nov 20 '18 at 8:00
FooFoo
1
answered Nov 20 '18 at 8:00
FooFoo
1
answered Nov 20 '18 at 8:00
FooFoo
1
1
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
@AsifShakir In that case, you just need[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message:First name is not valid.
– Foo
Nov 20 '18 at 8:47
add a comment |
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
@AsifShakir In that case, you just need[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message:First name is not valid.
– Foo
Nov 20 '18 at 8:47
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
Without using [Required] how i dont Allow empty string with Regex pattern.
– Asif Shakir
Nov 20 '18 at 8:44
@AsifShakir In that case, you just need
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.– Foo
Nov 20 '18 at 8:47
@AsifShakir In that case, you just need
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.– Foo
Nov 20 '18 at 8:47
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What is environment you are working in? programming language, web framework?
– Fabio
Nov 19 '18 at 23:22
1
Regexps cannot detect
nullvalues. They only work with strings. You might have meant empty string.– Wiktor Stribiżew
Nov 19 '18 at 23:25
@NRitH I already removed that tag
– Nick
Nov 20 '18 at 2:55
@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?
– Asif Shakir
Nov 20 '18 at 7:15
@Fabio please check i have edit the code for more clear understanding .
– Asif Shakir
Nov 20 '18 at 7:24