Regular Expression instance

1. Verification Number:
Only one number can be entered

 
Expression ^ \ D $
The description matches a number.
Matching example 0, 1, 2, 3
Example of Mismatch

2. Only n numbers can be entered
Expression ^ \ D {n} $ for example ^ \ D {8} $
The description matches 8 numbers.
Matching example: 12345678,22223334, 12344321
Example of Mismatch

3. You can only enter at least N numbers.
Expression ^ \ D {n ,}$ for example ^ \ D {8,} $
The description matches at least N numbers.
Matching example: 12345678,123456789, 12344321
Example of Mismatch

4. Only M to N numbers can be entered
Expression ^ \ D {M, N }$ for example ^ \ D {7, 8} $
The description matches m to N numbers.
Matching example: 12345678,1234567
Example of mismatched 123456,123456789

5. Only numbers can be entered.
Expression ^ [0-9] * $
The description matches any number.
Matching example: 12345678,1234567
Unmatched example E, clear month, http://blog.csdn.net/21aspnet

6. Only numbers in a certain range can be entered.
Expression ^ [12-15] $
Describe the number that matches a certain range
Matching example :,
Example of Mismatch

7. Only numbers with 0 and non-0 headers can be entered.
Expression ^ (0 | [1-9] [0-9] *) $
The description can be 0, the first number cannot be 0, and the number can contain 0
Matching example 101,100
Unmatched example 01, clear month, http://blog.csdn.net/21aspnet

8. Only real numbers can be input.
Expression ^ [-+]? \ D + (\. \ D + )? $
Description matching real number
Example 18, + 3.14,-9.90
Example of mismatched. 6, 33 S, 67-99

9. Only positive numbers of N decimal places can be entered.
Expression ^ [0-9] + (. [0-9] {n })? $ With ^ [0-9] + (. [0-9] {2 })? $ Example
Describe the positive number matching n decimal places
Example of matching 2.22
Unmatched example 2.222,-2.22, http://blog.csdn.net/21aspnet

10. Only the positive number of M-N decimal places can be entered.
Expression ^ [0-9] + (. [0-9] {m, n })? $ With ^ [0-9] + (. [0-9] {1, 2 })? $ Example
Describe the positive number of M to N decimal places
Matching examples 2.22, 2.2
Unmatched example 2.222,-2.2222, http://blog.csdn.net/21aspnet

11. Only positive integers other than 0 can be entered.
Expression ^ \ +? [1-9] [0-9] * $
Describe to match a positive integer other than 0
Matching example 2, 23, 234
Example 0,-4,

12. Only negative integers other than 0 can be entered.
Expression ^ \-[1-9] [0-9] * $
Describe to match a non-0 negative integer
Example of matching-2,-23 and-234
Examples of unmatched values 0, 4,

13. Only n characters can be entered
The expression ^. {n} $ takes ^. {4} $ as an example.
The description matches n characters. Note that the Chinese character is only one character.
Matching example 1234, 12we, 123 Clear, clear moon
Unmatched example 0,123,123 WWW, http://blog.csdn.net/21aspnet/

14. Only English characters can be entered
Expression ^. [A-Za-Z] + $
The description matches English characters and is case-insensitive.
Example of matching ASP, WWW,
Unmatched example 0,123,123 WWW, http://blog.csdn.net/21aspnet/

15. Only uppercase English characters can be entered
Expression ^. [A-Z] + $ as an Example
Description matching uppercase English characters
Matching example net, WWW,
Mismatched example 0,123,123 WWW,

16. Only lowercase English characters can be entered
Expression ^. [A-Z] + $
Description matching uppercase English characters
Example of matching ASP and csdn
Example 0, net, WWW,

17. Only English characters and numbers can be entered
Expression ^. [A-Za-z0-9] + $ as an Example
Description matching English characters + numbers
Example of matching: 1asp, w1w1w,
Unmatched example 0,123,123, WWW, http://blog.csdn.net/21aspnet/

18. Only English characters, numbers, and underscores can be entered.
The expression ^ \ W + $ is used as an example.
The description matches English characters, numbers, and underscores.
Example of matching: 1asp, WWW, 12,1_w
Unmatched Example 3 #, 2-4, w # $, http://blog.csdn.net/21aspnet/

19. Password example
Expression ^. [A-Za-Z] \ W {m, n} $
The description matches the M-n characters starting with an English character and can only contain numbers, letters, and underscores.
Matching example
Example of Mismatch

20. Verify uppercase letters
Expression \ B [^\ Wa-z0-9 _] [^ \ WA-Z0-9 _] * \ B
The first letter of the description can only be capitalized.
Example of matching ASP, Net
Unmatched example http://blog.csdn.net/21aspnet/

21. Verify the URL (? Id = Chinese) vs. net2005 does not have this function
Expression ^ http: \/([\ W-] + (\. [\ W-] +) + (\/[\ W -.\/\? % & = \ U4e00-\ u9fa5] *)? $
 
Description verification tape? Id = Chinese
Matching example http://blog.csdn.net/21aspnet,
Http://blog.csdn.net? Id = clear moon
Example of Mismatch

22. Verify Chinese Characters
Expression ^ [\ u4e00-\ u9fa5] {0,} $
Description can only contain Chinese Characters
Matching example: Clear moon
Unmatched example http://blog.csdn.net/21aspnet/

23. Verify the QQ number
Expression [0-9] {5, 9}
Description: QQ number of 5-9 digits
Example of matching
Unmatched example 10000 W, http://blog.csdn.net/21aspnet/

24. verify email (verify the same MSN number)
Expression \ W + ([-+. '] \ W +) * @ \ W + ([-.] \ W + )*\. \ W + ([-.] \ W + )*
Description Note: MSN can use a non-hotmail.com mailbox.
Example of matching [email protected]
Example of mismatched [email protected]. http://blog.csdn.net/21aspnet/

25. Verify the ID card number (for rough verification, it is best to tune the class library on the server side for further verification)
Expression ^ [1-9] ([0-9] {16} | [0-9] {13}) [xX0-9] $
Description
For example, if the ID card number is 15 or 18 digits, the ID card number with X is supported.
Unmatched example http://blog.csdn.net/21aspnet/

26. Verify the mobile phone number (including 159, excluding PHS)
Expression ^ 13 [0-9] {1} [0-9] {8} | ^ 15 [9] {1} [0-9] {8}
The description contains the mobile phone number 159-130.
Matching example 139 XXXXXXXX
Unmatched example 140 XXXXXXXX, http://blog.csdn.net/21aspnet/

27. Verify the phone number (very complicated, vs. net2005 gave the error)
Expression (imperfect) solution 1 (\ D {3} \) | \ D {3}-) | (\ D {4 }\) | \ D {4 }-))? (\ D {8} | \ D {7 })
Solution 2 (^ [0-9] {3, 4} \-[0-9] {3, 8} $) | (^ [0-9] {3, 8} $) | (^ \ ([0-9] {3, 4} \) [0-9] {3, 8} $) | (^ 0 {0, 1} 13 [0-9] {9} $) mobile phone numbers are supported but not perfect.
Description Shanghai: 02112345678 3 + 8 digits
Shanghai: 021-12345678
Shanghai: (021)-12345678
Shanghai: (021) 12345678
Zhengzhou: 03711234567 4 + 7 places
Hangzhou: 057112345678 4 + 8 places
There is also an extension number, country code.
Because the situation is very complex, we do not recommend that the front-end do 100% verification. So far, no one seems to be able to write a file containing all types. In fact, many situations are in conflict.
If anyone has a better phone number, leave a message.
 
Matching example
Example of Mismatch

28. verify passport
Expression (P \ D {7}) | G \ D {8 })
 
Description verification P + 7 digits and G + 8 digits
Matching example
Examples of mismatched clear moon, http://blog.csdn.net/21aspnet/

29. Verify the IP address
Expression ^ (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1-9] {1} [0-9] {1} | [1-9]) \. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [1-9] | 0) \. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [1-9] | 0) \. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [0-9]) $
 
Description verification IP Address
Example of matching: 192.168.0.1 222.234.1.4
Example of Mismatch

30. Verify the domain
Expression ^ [a-zA-Z0-9] + ([a-zA-Z0-9 \-\.] + )? \. S |) $
 
Description verification domain
Example of matching csdn.net Baidu.com it.com.cn
Example of mismatched 192.168.0.1

31. Verify credit card
Expression ^ ((? : 4 \ D {3}) | (? : 5 [1-5] \ D {2}) | (? : 6011) | (? : 3 [68] \ D {2}) | (? : 30 [012345] \ D) [-]? (\ D {4}) [-]? (\ D {4}) [-]? (\ D {4} | 3 [4, 7] \ D {13}) $
 
Description verification: Visa, MasterCard, discover, and American Express Card
Matching example
Example of Mismatch

32. Verify ISBN International Standard No.
Expression ^ (\ D [-] *) {9} [\ dxx] $
 
Description verification ISBN International Standard No.
Example of matching 7-111-19947-2
Example of Mismatch

33. Verify guid globally unique identifier
Expression ^ [A-Z0-9] {8}-[A-Z0-9] {4}-[A-Z0-9] {4}-[A-Z0-9] {4}-[A-Z0-9] {12} $
 
Description format: 8-4-4-4-12
Example of matching: 2064d355-c0b9-41d8-9ef7-9d8b26524751
Example of Mismatch

34. Verify the file path and extension
Expression ^ ([A-Za-Z] \: |\\) \ ([^ \] + \) * [^ \/:*? "<> |] + \. Txt (l )? $
 
Description check path and file extension
Matching example E: \ mo.txt
Example of mismatch E: \, mo.doc, E: \ mo.doc, http://blog.csdn.net/21aspnet/

35. Verify the HTML color value
Expression ^ #? ([A-F] | [A-F] | [0-9]) {3} ([A-F] | [A-F] | [0-9]) {3 })? $
 
Description Check color value
Matching example # ff0000
Unmatched example http://blog.csdn.net/21aspnet/

^ [1-9] \ D * \. \ D * | 0 \. \ D * [1-9] \ D * $

Integer or decimal point: ^ [0-9] + \. {} [0-9] {} $
Only numbers are allowed: "^ [0-9] * $ ".
Only n digits can be entered: "^ \ D {n} $ ".
You can only enter at least N digits: "^ \ D {n,} $ ".
Only M ~ can be input ~ N-digit :. "^ \ D {m, n} $"
Only numbers starting with zero and non-zero can be entered: "^ (0 | [1-9] [0-9] *) $ ".
Only positive numbers with two decimal places can be entered: "^ [0-9] + (. [0-9] {2 })? $ ".
Only 1 ~ Positive number of three decimal places: "^ [0-9] + (. [0-9] {1, 3 })? $ ".
Only a non-zero positive integer can be entered: "^ \ +? [1-9] [0-9] * $ ".
Only a non-zero negative integer can be entered: "^ \-[1-9] [] 0-9" * $.
Only 3 characters can be entered: "^. {3} $ ".
You can only enter a string consisting of 26 English letters: "^ [A-Za-Z] + $ ".
You can only enter a string consisting of 26 uppercase letters: "^ [A-Z] + $ ".
You can only enter a string consisting of 26 lower-case English letters: "^ [A-Z] + $ ".
You can only enter a string consisting of a number and 26 English letters: "^ [A-Za-z0-9] + $ ".
You can only enter a string consisting of digits, 26 English letters, or underscores (_): "^ \ W + $ ".
Verify the User Password: "^ [A-Za-Z] \ W {5, 17} $". The correct format is: start with a letter, with a length of 6 ~ It can only contain characters, numbers, and underscores.
Check whether ^ % & ',; =? $ \ "And other characters:" [^ % & ',; =? $ \ X22] + ".
Only Chinese characters can be entered: "^ [\ u4e00-\ u9fa5] {0,} $"
Verify email address: "^ \ W + ([-+.] \ W +) * @ \ W + ([-.] \ W + )*\. \ W + ([-.] \ W +) * $ ".
Verify interneturl: "^ http: // ([\ W-] + \.) + [\ W-] + (/[\ W -./? % & =] *)? $ ".
Verification phone number: "^ (\ D {3, 4}-) | \ D {3.4 }-)? \ D {7,8} $ "correct format:" XXX-XXXXXXX "," XXXX-XXXXXXXX "," XXX-XXXXXXX "," XXX-XXXXXXXX "," xxxxxxx "and" XXXXXXXX ".
Verify the ID card number (15 or 18 digits): "^ \ D {15} | \ D {18} $ ".
12 months of verification: "^ (0? [1-9] | 1 [0-2]) $ "the correct format is:" 01 "~ "09" and "1 "~ "12 ".
31 days of verification for a month: "^ (0? [1-9]) | (1 | 2) [0-9]) | 30 | 31) $ "the correct format is;" 01 "~ "09" and "1 "~ "31 ".
Regular Expression matching Chinese characters: [\ u4e00-\ u9fa5]

Match double-byte characters (including Chinese characters): [^ \ x00-\ xFF]

Application: Calculate the length of a string (two-byte length Meter 2, ASCII character meter 1)
String. Prototype. Len = function () {return this. Replace (/[^ \ x00-\ xFF]/g, "AA"). length ;}

Regular Expression for matching empty rows: \ n [\ s |] * \ r

Regular Expressions matching HTML tags: <(. *)> (. *) <\/(. *) >|< (. *) \/>

Regular Expression matching spaces at the beginning and end: (^ \ s *) | (\ s * $)

Application: JavaScript does not have trim functions like VBScript. We can use this expression to implement it, as shown below:

String. Prototype. Trim = function ()
{
Return this. Replace (/(^ \ s *) | (\ s * $)/g ,"");
}

Use regular expressions to break down and convert IP addresses:

The following is a javascript program that uses regular expressions to match IP addresses and convert IP addresses to corresponding values:

Function ip2v (IP)
{
Re =/(\ D +) \. (\ D +)/g // Regular Expression matching IP addresses
If (Re. Test (IP ))
{
Return Regexp. $1 * Math. Pow (255) + Regexp. $2 * Math. Pow () + Regexp. $3 * + Regexp. $4*1
}
Else
{
Throw new error ("not a valid IP address! ")
}
}

However, if the above program does not use regular expressions, it may be easier to directly use the split function to separate them. The program is as follows:

VaR IP = "10.100.0000168"
IP = IP. Split (".")
Alert ("the IP value is: "+ (IP [0] * 255*255*255 + IP [1] * 255*255 + IP [2] * 255 + IP [3] * 1 ))

The regular expression matching the email address: \ W + ([-+.] \ W +) * @ \ W + ([-.] \ W + )*\. \ W + ([-.] \ W + )*

The regular expression matching the URL: http: // ([\ W-] + \.) + [\ W-] + (/[\ W -./? % & =] *)?


Use regular expressions to restrict text box input in a webpage form:

You can only enter Chinese characters using regular expressions: onkeyup = "value = value. replace (/[^ \ u4e00-\ u9fa5]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ u4e00-\ u9fa5]/g ,''))"

You can only enter the full-width characters: onkeyup = "value = value. replace (/[^ \ uff00-\ Uffff]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ uff00-\ Uffff]/g ,''))"

Use a regular expression to limit that only numbers can be entered: onkeyup = "value = value. replace (/[^ \ D]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ D]/g ,''))"

You can only enter numbers and English letters using regular expressions: onkeyup = "value = value. replace (/[\ W]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ D]/g ,''))"

<Input onkeyup = "value = value. replace (/[^ \ u4e00-\ u9fa5 \ W]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ u4e00-\ u9fa5 \ W]/g, '')" value = "underlines, numbers, letters, and Chinese characters allowed">

<Script language = "JavaScript">
If (document. layers) // triggers a keyboard event
Document. captureevents (event. keypress)

Function xz (thsv, NOb ){
If (NOB = "2 "){
Window. clipboardData. setdata ("text ","")
Alert ("avoid illegal character input, do not copy characters ");
Return false;
}
If (event. keycode! = 8 & event. keycode! = 16 & event. keycode! = 37 & event. keycode! = 38 & event. keycode! = 39 & event. keycode! = 40 ){
Thsvv = thsv. value; // input value
Thsvs = thsvv. substring (thsvv. Length-1); // The last character entered
// Thsvss = thsvv. substring (0, thsvv. Length-1); // remove the last Error Character
If (! Thsvs. Replace (/[^ \ u4e00-\ u9fa5 \ W]/g, '') | event. keycode = 189) {// Regular Expression removes symbols and underline keys
Thsv. value = 'do not enter the invalid symbol [' + thsvs + ']';
Alert ('Do not enter invalid symbols ['+ thsvs +'] ');
Thsv. value = "";
Return false;
}
}
}

</SCRIPT>

<Input onkeyup = "xz (this, 1)" onpaste = "xz (this, 2)" value = ""> allow numbers, letters, and Chinese characters

<Script language = "JavaScript">
<! --
Function maxlength (field, maxlimit ){
VaR J = field. value. Replace (/[^ \ x00-\ xFF]/g, "**"). length;
// Alert (j );
VaR tempstring = field. value;
VaR TT = "";
If (j> maxlimit ){
For (VAR I = 0; I <maxlimit; I ++ ){
If (TT. Replace (/[^ \ x00-\ xFF]/g, "**"). Length <maxlimit)
Tt = tempstring. substr (0, I + 1 );
Else
Break;
}
If (TT. Replace (/[^ \ x00-\ xFF]/g, "**"). length> maxlimit)
Tt = TT. substr (0, TT. Length-1 );
Field. value = tt;
} Else {
;
}
}
</SCRIPT>

Single Row text box Control <br/>
<Input type = "text" id = "text1" name = "text1" onpropertychange = "maxlength (this, 5)"> <br/>
Multi-line text box control: <br/>
<Textarea rows = "14"
Cols = "39" id = "textarea1" name = "textarea1" onpropertychange = "maxlength (this, 15)"> </textarea> <br/>

Only numbers can be entered in the control form ....
<SCRIPT>
Function Test ()
{
If (document. A. B. value. length> 50)
{
Alert ("cannot exceed 50 characters! ");
Document. A. B. Focus ();
Return false;
}
}
</SCRIPT>
<Form name = A onsubmit = "return test ()">
<Textarea name = "B" Cols = "40" Wrap = "virtual" rows = "6"> </textarea>
<Input type = "Submit" name = "Submit" value = "check">
</Form>

Only Chinese Characters
<Input onkeyup = "value = value. Replace (/[^ \ u4e00-\ u9fa5]/g,'') ">

Only English characters are allowed
<Script language = JavaScript>
Function onlyeng ()
{
If (! (Event. keycode> = 65 & event. keycode <= 90 ))
Event. returnvalue = false;
}
</SCRIPT>

<Input onkeydown = "onlyeng ();">
<Input name = "coname" type = "text" size = "50" maxlength = "35" class = "input2" onkeyup = "value = value. replace (/[\ W]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ D]/g, '')">
Only numbers are allowed.
<Script language = JavaScript>
Function onlynum ()
{
If (! (Event. keycode> = 48 & event. keycode <= 57) | (event. keycode> = 96 & event. keycode <= 105 )))
// Consider the numeric keys on the keypad
Event. returnvalue = false;
}
</SCRIPT>

<Input onkeydown = "onlynum ();">

Only English characters and numbers are allowed
<Input onkeyup = "value = value. replace (/[\ W]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ D]/g, '')">

Verify as email format
<Script language = JavaScript runat = Server>
Function isemail (stremail ){
If (stremail. search (/^ \ W + (-\ W +) | (\. \ W +) * \ @ [A-Za-z0-9] + ((\. |-) [A-Za-z0-9] + )*\. [A-Za-z0-9] + $ /)! =-1)
Return true;
Else
Alert ("oh ");
}
</SCRIPT>
<Input type = text onblur = isemail (this. Value)>

Blocked keywords (sex, fuck)-modified
<Script language = "javascript1.2">
Function Test (){
If (A. B. value. indexof ("sex") = 0) | (A. B. value. indexof ("fuck") = 0 )){
Alert ("five lectures, four beautiful three love ");
A. B. Focus ();
Return false ;}
}
</SCRIPT>
<Form name = A onsubmit = "return test ()">
<Input type = text name = B>
<Input type = "Submit" name = "Submit" value = "check">
</Form>


Only numbers can be entered in the restricted text box.
<Input onkeyup = "If (event. keycode! = 37 & event. keycode! = 39) value = value. replace (/\ D/g, '');" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/\ D/g, '')">

Mobile phone number :( ^ (\ D {3, 4 }-)? \ D {7, 8}) $ | (13 [0-9] {9}) | (15 [8-9] {9 })

No, you can write it according to the above description. It just takes some time.

 

Regular Expression set for verifying numbers
Verification number: ^ [0-9] * $
Verify the n-digit number: ^ \ D {n} $
Verify at least N digits: ^ \ D {n,} $
Verify M-N digits: ^ \ D {m, n} $
Verify the number starting with zero or zero: ^ (0 | [1-9] [0-9] *) $
Verify the positive number of two decimal places: ^ [0-9] + (. [0-9] {2 })? $
Verify the positive number of 1-3 decimal places: ^ [0-9] + (. [0-9] {1, 3 })? $
Verify a non-zero positive integer: ^ \ +? [1-9] [0-9] * $
Verify a non-zero negative integer: ^ \-[1-9] [0-9] * $
Verify non-negative integer (positive integer + 0) ^ \ D + $
Verify non-positive integer (negative integer + 0) ^ (-\ D +) | (0 +) $
3 characters for verification: ^. {3} $
Verify a string consisting of 26 English letters: ^ [A-Za-Z] + $
Verify a string consisting of 26 uppercase letters: ^ [A-Z] + $
Verify a string consisting of 26 lower-case letters: ^ [A-Z] + $
Verify a string consisting of digits and 26 English letters: ^ [A-Za-z0-9] + $
Verify a string consisting of digits, 26 English letters, or underscores: ^ \ W + $
Verify User Password: ^ [A-Za-Z] \ W {5, 17} $ the correct format is: it must start with a letter and be between 6 and 18 characters. It can only contain characters, numbers, and underscores.
Check whether ^ % & ',; =? $ \ "And other characters: [^ % & ',; =? $ \ X22] +
Verify Chinese characters: ^ [\ u4e00-\ u9fa5], {0,} $
Verify email address: ^ \ W + [-+.] \ W +) * @ \ W + ([-.] \ W + )*\. \ W + ([-.] \ W +) * $
Verify interneturl: ^ http: // ([\ W-] + \.) + [\ W-] + (/[\ W -./? % & =] *)? $; ^ [A-Za-Z] +: // (W + (-W +) *) (. (W + (-W + )*))*(? S *)? $
Verification phone number: ^ (\ D {3, 4} \) | \ D {3, 4 }-)? \ D {7,8} $: -- the correct format is: XXXX-XXXXXXX, XXXX-XXXXXXXX, XXX-XXXXXXX, XXX-XXXXXXXX, xxxxxxx, XXXXXXXX.
Verify the ID card number (15 or 18 digits): ^ \ D {15} | \ D {} 18 $
12 months of verification: ^ (0? [1-9] | 1 [0-2]) $ the correct format is: "01"-"09" and "1" "12"
31 days of verification for a month: ^ (0? [1-9]) | (1 | 2) [0-9]) | 30 | 31) $ the correct format is: 01, 09, 1, 31.
Integer: ^ -? \ D + $
Non-negative floating point number (Positive floating point number + 0): ^ \ D + (\. \ D + )? $
Positive floating point number ^ ([0-9] + \. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] * \. [0-9] +) | ([0-9] * [1-9] [0-9] *) $
Non-Positive floating point number (negative floating point number + 0) ^ (-\ D + (\. \ D + )?) | (0 + (\. 0 + )?)) $
Negative floating point number ^ (-([0-9] + \. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] * \. [0-9] +) | ([0-9] * [1-9] [0-9] *) $
Floating Point Number ^ (-? \ D +) (\. \ D + )?