Simple regular expression for a decimal with a precision of 2

Question

What is the regular expression for a decimal with a precision of 2   Valid examples   123 12 2 56754 92929292929292 12 0 21 3 1   Invalid examples   12 1232 2 23332 e666 76   The decimal point may be optional  and integers may also be included

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To include an optional minus sign and to disallow numbers like 015  which can be mistaken for octal numbers  write   -  0   1-9  d       d

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For numbers that don t have a thousands separator  I like this simple  compact regex    d     d 2       d 2    or  to not be limited to a precision of 2    d     d       d    The latter matches 1 100 100  100 74 100 7 0 7  7  72  And it doesn t match empty string  like  d    d  would

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adding my answer too  someone might find it useful or may be correct mine too   function getInteger int     var regx      -     d     g    return regx test int       alert getInteger  -11 11

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I tried one with my project  This allows numbers with     - signs as well         -   0-9  0        1  0-9  1    0 1

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Won t you need to take the e in e666 76 into account   With   e 0-9  d  d  d 1 2

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Try this        -    0-9       0-9       It will allow positive and negative signs also

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Main answer is WRONG because it valids 5  or 5  inputs  this code handle it  but in my example negative numbers are forbidden        0-9        0-9  1 2         results are bellow      true      0    true      0 00    true      0 0    true      0 00    true      0 0    true      1 2    true      1 1    true      1    true      100   true      100 00    true      100 0     true        1 11    true      1 11    false      -5     false      -0 00    true      101    false        0 00 0    true      0 000    true      000 25    false       25    true      100 01      true      100 2    true      00    false      5     false      6     true      82    true        81 3    true      7    true      7 654

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Valid regex tokens vary by implementation  A generic form is    0-9      0-9  0-9       More compact    d     d 1 2      Both assume that both have at least one digit before and one after the decimal place   To require that the whole string is a number of this form  wrap the expression in start and end tags such as  in Perl s form      d     d 1 2       To match numbers without a leading digit before the decimal   12  and whole numbers having a trailing period  12   while excluding input of a single period      try the following      d     d 0 2        d 1 2        Added  Wrapped the fractional portion in     to make it optional   Be aware that this excludes forms such as 12   Including that would be more like   d      d 0 2     Added  Use   d 1 6     d 1 2     to stop repetition and give a restriction to whole part of the decimal value

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preg match    -  d       d d      sum

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This worked with me    -  0-9      0-9        Group 1 is the your float number and group 2 is the fraction only

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For numbers that don t have a thousands separator  I like this simple  compact regex    d     d 2       d 2    or  to not be limited to a precision of 2    d     d       d    The latter matches 1 100 100  100 74 100 7 0 7  7  72  And it doesn t match empty string  like  d    d  would

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0-9      0-9  1 2       And since regular expressions are horrible to read  much less understand  here is the verbose equivalent                               Start of string   0-9                       Require one or more numbers                             Begin optional group                             Point must be escaped or it is treated as  any character             0-9  1 2         One or two numbers                             End group--signify that it s optional with                                 End of string   You can replace  0-9  with  d in most regular expression implementations  including PCRE  the most common   I ve left it as  0-9  as I think it s easier to read   Also  here is the simple Python script I used to check it   import re deci num checker   re compile r     0-9      0-9  1 2          valid     123 12    2    56754    92929292929292 12    0 21    3 1   invalid     12 1232    2 23332    e666 76    assert len  deci num checker match x     None for x in valid      len valid  assert  deci num checker match x     None for x in invalid  count False     0

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Chrome 56 is not accepting this kind of patterns  Chrome 56 is accpeting 11 11  an additional    with type number  use type as text as progress

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0-9      0-9  1 2       And since regular expressions are horrible to read  much less understand  here is the verbose equivalent                               Start of string   0-9                       Require one or more numbers                             Begin optional group                             Point must be escaped or it is treated as  any character             0-9  1 2         One or two numbers                             End group--signify that it s optional with                                 End of string   You can replace  0-9  with  d in most regular expression implementations  including PCRE  the most common   I ve left it as  0-9  as I think it s easier to read   Also  here is the simple Python script I used to check it   import re deci num checker   re compile r     0-9      0-9  1 2          valid     123 12    2    56754    92929292929292 12    0 21    3 1   invalid     12 1232    2 23332    e666 76    assert len  deci num checker match x     None for x in valid      len valid  assert  deci num checker match x     None for x in invalid  count False     0

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Valid regex tokens vary by implementation  A generic form is    0-9      0-9  0-9       More compact    d     d 1 2      Both assume that both have at least one digit before and one after the decimal place   To require that the whole string is a number of this form  wrap the expression in start and end tags such as  in Perl s form      d     d 1 2       To match numbers without a leading digit before the decimal   12  and whole numbers having a trailing period  12   while excluding input of a single period      try the following      d     d 0 2        d 1 2        Added  Wrapped the fractional portion in     to make it optional   Be aware that this excludes forms such as 12   Including that would be more like   d      d 0 2     Added  Use   d 1 6     d 1 2     to stop repetition and give a restriction to whole part of the decimal value

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Won t you need to take the e in e666 76 into account   With   e 0-9  d  d  d 1 2

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I use this one for up to two decimal places         -  0   1-9  0-9        0-9  1 2         0 0 1    1-9  0-9        0-9  1 2      passes   25 0 25 10 25  0 25  doesn t pass  - 25 01 25 1  1 256

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Valid regex tokens vary by implementation  A generic form is    0-9      0-9  0-9       More compact    d     d 1 2      Both assume that both have at least one digit before and one after the decimal place   To require that the whole string is a number of this form  wrap the expression in start and end tags such as  in Perl s form      d     d 1 2       To match numbers without a leading digit before the decimal   12  and whole numbers having a trailing period  12   while excluding input of a single period      try the following      d     d 0 2        d 1 2        Added  Wrapped the fractional portion in     to make it optional   Be aware that this excludes forms such as 12   Including that would be more like   d      d 0 2     Added  Use   d 1 6     d 1 2     to stop repetition and give a restriction to whole part of the decimal value

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preg match    -  d       d d      sum

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In general  i e  unlimited decimal places    -    1-9  d   0   0  1-9  0  1-9

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function DecimalNumberValidation             var amounttext                 if       -    d     d    test document getElementById  txtRemittanceNumber   value                 alert  Please enter only numbers into amount textbox                              else                           alert  Right Number                          function will validate any decimal number weather number has decimal places or not  it will say  Right Number  other wise  Please enter only numbers into amount textbox   alert message will come up   Thanks

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0-9      0-9  1 2       And since regular expressions are horrible to read  much less understand  here is the verbose equivalent                               Start of string   0-9                       Require one or more numbers                             Begin optional group                             Point must be escaped or it is treated as  any character             0-9  1 2         One or two numbers                             End group--signify that it s optional with                                 End of string   You can replace  0-9  with  d in most regular expression implementations  including PCRE  the most common   I ve left it as  0-9  as I think it s easier to read   Also  here is the simple Python script I used to check it   import re deci num checker   re compile r     0-9      0-9  1 2          valid     123 12    2    56754    92929292929292 12    0 21    3 1   invalid     12 1232    2 23332    e666 76    assert len  deci num checker match x     None for x in valid      len valid  assert  deci num checker match x     None for x in invalid  count False     0

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Won t you need to take the e in e666 76 into account   With   e 0-9  d  d  d 1 2

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I use this one for up to two decimal places         -  0   1-9  0-9        0-9  1 2         0 0 1    1-9  0-9        0-9  1 2      passes   25 0 25 10 25  0 25  doesn t pass  - 25 01 25 1  1 256

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0-9      0-9  1 2       And since regular expressions are horrible to read  much less understand  here is the verbose equivalent                               Start of string   0-9                       Require one or more numbers                             Begin optional group                             Point must be escaped or it is treated as  any character             0-9  1 2         One or two numbers                             End group--signify that it s optional with                                 End of string   You can replace  0-9  with  d in most regular expression implementations  including PCRE  the most common   I ve left it as  0-9  as I think it s easier to read   Also  here is the simple Python script I used to check it   import re deci num checker   re compile r     0-9      0-9  1 2          valid     123 12    2    56754    92929292929292 12    0 21    3 1   invalid     12 1232    2 23332    e666 76    assert len  deci num checker match x     None for x in valid      len valid  assert  deci num checker match x     None for x in invalid  count False     0

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function DecimalNumberValidation             var amounttext                 if       -    d     d    test document getElementById  txtRemittanceNumber   value                 alert  Please enter only numbers into amount textbox                              else                           alert  Right Number                          function will validate any decimal number weather number has decimal places or not  it will say  Right Number  other wise  Please enter only numbers into amount textbox   alert message will come up   Thanks

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This worked with me    -  0-9      0-9        Group 1 is the your float number and group 2 is the fraction only

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This will allow decimal with exponentiation and upto 2 digits        -   d     d 2   eE  - 1-9   0-9          d          Demo

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Won t you need to take the e in e666 76 into account   With   e 0-9  d  d  d 1 2

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In general  i e  unlimited decimal places    -    1-9  d   0   0  1-9  0  1-9

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0-9       0-9  1 2         Will make things like 12  accepted  This is not what is commonly accepted but if in case you need to be    flexible     that is one way to go  And of course  0-9  can be replaced with  d  but I guess it   s more readable this way

User · Answer

Try this        -    0-9       0-9       It will allow positive and negative signs also

User · Answer

Main answer is WRONG because it valids 5  or 5  inputs  this code handle it  but in my example negative numbers are forbidden        0-9        0-9  1 2         results are bellow      true      0    true      0 00    true      0 0    true      0 00    true      0 0    true      1 2    true      1 1    true      1    true      100   true      100 00    true      100 0     true        1 11    true      1 11    false      -5     false      -0 00    true      101    false        0 00 0    true      0 000    true      000 25    false       25    true      100 01      true      100 2    true      00    false      5     false      6     true      82    true        81 3    true      7    true      7 654

User · Answer

Valid regex tokens vary by implementation  A generic form is    0-9      0-9  0-9       More compact    d     d 1 2      Both assume that both have at least one digit before and one after the decimal place   To require that the whole string is a number of this form  wrap the expression in start and end tags such as  in Perl s form      d     d 1 2       To match numbers without a leading digit before the decimal   12  and whole numbers having a trailing period  12   while excluding input of a single period      try the following      d     d 0 2        d 1 2        Added  Wrapped the fractional portion in     to make it optional   Be aware that this excludes forms such as 12   Including that would be more like   d      d 0 2     Added  Use   d 1 6     d 1 2     to stop repetition and give a restriction to whole part of the decimal value

User · Answer

I tried one with my project  This allows numbers with     - signs as well         -   0-9  0        1  0-9  1    0 1

User · Answer

This will allow decimal with exponentiation and upto 2 digits        -   d     d 2   eE  - 1-9   0-9          d          Demo

User · Answer

Chrome 56 is not accepting this kind of patterns  Chrome 56 is accpeting 11 11  an additional    with type number  use type as text as progress

User · Answer

0-9       0-9  1 2         Will make things like 12  accepted  This is not what is commonly accepted but if in case you need to be    flexible     that is one way to go  And of course  0-9  can be replaced with  d  but I guess it   s more readable this way

User · Answer

adding my answer too  someone might find it useful or may be correct mine too   function getInteger int     var regx      -     d     g    return regx test int       alert getInteger  -11 11

User · Answer

To include an optional minus sign and to disallow numbers like 015  which can be mistaken for octal numbers  write   -  0   1-9  d       d

[regex] Simple regular expression for a decimal with a precision of 2

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