How do I include negative decimal numbers in this regular expression

Question

How do I match negative numbers as well by this regular expression   This regex works fine with positive values  but I want it to also allow negative values e g  -10  -125 5 etc      0-9  d     d       Thanks

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UPDATED 13 08 2014   This is the best code for positive and negative numbers       - 0   0-9   1-9   0-9       -  1-9   0-9       0-9   1-9   0-9         0-9        -  1-9   0-9       0   1    I tried with this numbers and works fine   -1234454 3435 -98 99 -12 9 -12 34 -10 001 -3 -0 001 -000 -0 00 0 0 00 00000001 1 0 01 1201 0000001 1234454 3435 7638 98701

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This will allow a - or   character only when followed by a number        -        d     d       d

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Regular expression for number  optional decimal point  optional negative    -   d      d      works for negative integer  decimal  negative with decimal

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This worked for me  allowing both negative and positive numbers     -  d    If using C    Regex Match someString     -  d    Value

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-  d     -  d     allow   23425 23425 10 10 100 0 0 00 -100 -10 10 10 -10 -10 -10 -23425 23425 -23425 -23425 0 234

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Just add a 0 or 1 token    -  0-9  d    d

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I have some experiments about regex in django url  which required from negative to positive numbers     P lt pid gt   - d   d       Let s we focused on this   - d   d   part and ignoring others  this semicolon   means OR in regex  then the negative value will match with this  - d  part  and positive value into this  d

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Some Regular expression examples   Positive Integers     d     Negative Integers    - d     Integer    -  d     Positive Number     d     d     Negative Number    - d     d     Positive Number or Negative Number    -  d    0 1  d     Phone number         d s  3      Phone with code         d s       d s  10      Year 1900-2099     19 20   d  2 2     Date  dd mm yyyy  d m yyyy  etc        1-9  0 1-9   12  0-9  3 01   D  1-9  0 1-9  1 012   D 19 0-9  0-9  20 0-9  0-9      IP v4      d  1-9  d 1 d d 2 0-4  d 25 0-5      d  1-9  d 1 d d 2 0-4  d 25 0-5   3

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For negative number only  this is perfect    - d     d

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-   d 1 18     d 1 2       accepts positive or negative decimal values

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This will allow both positive and negative integers     ValidationExpression   -  0-9  d   d

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You should add an optional hyphen at the beginning by adding -     is a quantifier meaning one or zero occurrences     -  0-9  d     d       I verified it in Rubular with these values   10 00 -10 00   and both matched as expected

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I don t know why you need that first  0-9   Try   -  d     d      Update If you want to be sure that you ll have a digit on the ones place  then use  -  d     d

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If you have this val  -12XXX 0abc23  and you want to extract only the decimal number  in this case this regex   -  0-9  d     d      will not help you to achieve it  this is the proper code with the correct detection regex   x000D   x000D  var val  -12XXX 0abc23   x000D  val   val replace        -  d                0     d  g       x000D  console log val   x000D   x000D   x000D

[regex] How do I include negative decimal numbers in this regular expression?

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