Regex for numbers only

Question

I haven t used regular expressions at all  so I m having difficulty troubleshooting  I want the regex to match only when the contained string is all numbers  but with the two examples below it is matching a string that contains all numbers plus an equals sign like  1234 4321   I m sure there s a way to change this behavior  but as I said  I ve never really done much with regular expressions   string compare    1234 4321   Regex regex   new Regex     d      if  regex IsMatch compare            true    regex   new Regex   0-9      if  regex IsMatch compare            true     In case it matters  I m using C  and  NET2 0

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d    which is  start of string    1 or more digits    end of string  in English

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Another way  If you like to match international numbers such as Persian or Arabic  so you can use following expression   Regex   new Regex      p N          To match literal period character use   Regex   new Regex      p N

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If you need to tolerate decimal point and thousand marker  var regex   new Regex    -  0-9  0-9            You will need a  -   if the number can go negative

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It is matching because it is finding  a match  not a match of the full string  You can fix this by changing your regexp to specifically look for the beginning and end of the string     d

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Use the beginning and end anchors   Regex regex   new Regex     d       Use    d    if you need to match more than one digit     Note that   d  will match  0-9  and other digit characters like the Eastern Arabic numerals              Use    0-9     to restrict matches to just the Arabic numerals 0 - 9     If you need to include any numeric representations other than just digits  like decimal values for starters   then see  tchrist s comprehensive guide to parsing numbers with regular expressions

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Here is my working one     -  1-9    d       d        - 0     d  1-9      0    And some tests  Positive tests   string   goodNumbers   3   -3   0   0 0   1 0   0 1   0 0001   -555   94549870965      Negative tests   string   badNums   a          -   001   -00 2   000 5    3   3     -1   --1   - 1   -0      Checked not only for C   but also with Java  Javascript and PHP

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Perhaps my method will help you        public static bool IsNumber string s                return s All char IsDigit

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It is matching because it is finding  a match  not a match of the full string  You can fix this by changing your regexp to specifically look for the beginning and end of the string     d

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This works with integers and decimal numbers  It doesn t match if the number has the coma thousand separator       -   d       d        some strings that matches with this   894 923 21 76876876  32 -894 -923 21 -76876876 - 32   some strings that doesn t   hello 9bye hello9bye 888 323 5 434 3 -8 336 09 87078

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If you need to tolerate decimal point and thousand marker  var regex   new Regex    -  0-9  0-9            You will need a  -   if the number can go negative

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It is matching because it is finding  a match  not a match of the full string  You can fix this by changing your regexp to specifically look for the beginning and end of the string     d

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If you want to extract only numbers from a string the pattern   d   should help

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Your regex will match anything that contains a number  you want to use anchors to match the whole string and then match one or more numbers   regex   new Regex    0-9         The   will anchor the beginning of the string  the   will anchor the end of the string  and the   will match one or more of what precedes it  a number in this case

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Another way  If you like to match international numbers such as Persian or Arabic  so you can use following expression   Regex   new Regex      p N          To match literal period character use   Regex   new Regex      p N

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If you want to extract only numbers from a string the pattern   d   should help

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Use the beginning and end anchors   Regex regex   new Regex     d       Use    d    if you need to match more than one digit     Note that   d  will match  0-9  and other digit characters like the Eastern Arabic numerals              Use    0-9     to restrict matches to just the Arabic numerals 0 - 9     If you need to include any numeric representations other than just digits  like decimal values for starters   then see  tchrist s comprehensive guide to parsing numbers with regular expressions

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Use the beginning and end anchors   Regex regex   new Regex     d       Use    d    if you need to match more than one digit     Note that   d  will match  0-9  and other digit characters like the Eastern Arabic numerals              Use    0-9     to restrict matches to just the Arabic numerals 0 - 9     If you need to include any numeric representations other than just digits  like decimal values for starters   then see  tchrist s comprehensive guide to parsing numbers with regular expressions

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Sorry for ugly formatting  For any number of digits    0-9     For one or more digit    0-9

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Regex regex   new Regex     0-9  1 4   0-9  1 4

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Your regex will match anything that contains a number  you want to use anchors to match the whole string and then match one or more numbers   regex   new Regex    0-9         The   will anchor the beginning of the string  the   will anchor the end of the string  and the   will match one or more of what precedes it  a number in this case

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Your regex will match anything that contains a number  you want to use anchors to match the whole string and then match one or more numbers   regex   new Regex    0-9         The   will anchor the beginning of the string  the   will anchor the end of the string  and the   will match one or more of what precedes it  a number in this case

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Perhaps my method will help you        public static bool IsNumber string s                return s All char IsDigit

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This works with integers and decimal numbers  It doesn t match if the number has the coma thousand separator       -   d       d        some strings that matches with this   894 923 21 76876876  32 -894 -923 21 -76876876 - 32   some strings that doesn t   hello 9bye hello9bye 888 323 5 434 3 -8 336 09 87078

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Sorry for ugly formatting  For any number of digits    0-9     For one or more digit    0-9

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Use beginning and end anchors   Regex regex   new Regex   quot   d  quot     Use  quot   d   quot  if you need to match more than one digit

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Regex for integer and floating point numbers      -   d    d      -   d     d       A number can start with a period  without leading digits s    and a number can end with a period  without trailing digits s    Above regex will recognize both as correct numbers   A    period  itself without any digits is not a correct number  That s why we need two regex parts there  separated with a        Hope this helps

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Use beginning and end anchors   Regex regex   new Regex   quot   d  quot     Use  quot   d   quot  if you need to match more than one digit

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If you need to check if all the digits are number  0-9  or not     0-9      1425 TRUE  0142 TRUE  0 TRUE  1 TRUE  154a25 FALSE  1234 3254 FALSE

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While non of the above solutions was fitting my purpose  this worked for me   var pattern       -  1-9   d      d        - 0    d  1-9      0   0 0    return Regex Match value  pattern  RegexOptions IgnoreCase  Success    Example of valid values   3    -3    0    0 0    1 0    0 7    690 7    0 0001    -555    945465464654   Example of not valid values   a                  -    001    00 2    000 5     3    3      -1    --1    - 1    -0    00099    099

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d    which is  start of string    1 or more digits    end of string  in English

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It is matching because it is finding  a match  not a match of the full string  You can fix this by changing your regexp to specifically look for the beginning and end of the string     d

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Here is my working one     -  1-9    d       d        - 0     d  1-9      0    And some tests  Positive tests   string   goodNumbers   3   -3   0   0 0   1 0   0 1   0 0001   -555   94549870965      Negative tests   string   badNums   a          -   001   -00 2   000 5    3   3     -1   --1   - 1   -0      Checked not only for C   but also with Java  Javascript and PHP

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I think that this one is the simplest one and it accepts European and USA way of writing numbers e g  USA 10 555 12  European 10 555 12 Also this one does not allow several commas or dots one after each other e g  10  22 or 10  22 In addition to this numbers like  55 or  55 would pass  This may be handy            0-9

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I think that this one is the simplest one and it accepts European and USA way of writing numbers e g  USA 10 555 12  European 10 555 12 Also this one does not allow several commas or dots one after each other e g  10  22 or 10  22 In addition to this numbers like  55 or  55 would pass  This may be handy            0-9

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d    which is  start of string    1 or more digits    end of string  in English

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Regex for integer and floating point numbers      -   d    d      -   d     d       A number can start with a period  without leading digits s    and a number can end with a period  without trailing digits s    Above regex will recognize both as correct numbers   A    period  itself without any digits is not a correct number  That s why we need two regex parts there  separated with a        Hope this helps

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Regex regex   new Regex     0-9  1 4   0-9  1 4

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Your regex will match anything that contains a number  you want to use anchors to match the whole string and then match one or more numbers   regex   new Regex    0-9         The   will anchor the beginning of the string  the   will anchor the end of the string  and the   will match one or more of what precedes it  a number in this case

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While non of the above solutions was fitting my purpose  this worked for me   var pattern       -  1-9   d      d        - 0    d  1-9      0   0 0    return Regex Match value  pattern  RegexOptions IgnoreCase  Success    Example of valid values   3    -3    0    0 0    1 0    0 7    690 7    0 0001    -555    945465464654   Example of not valid values   a                  -    001    00 2    000 5     3    3      -1    --1    - 1    -0    00099    099

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console log    0  1-9  0-9      test 3000      true

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console log    0  1-9  0-9      test 3000      true

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d    which is  start of string    1 or more digits    end of string  in English

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Use the beginning and end anchors   Regex regex   new Regex     d       Use    d    if you need to match more than one digit     Note that   d  will match  0-9  and other digit characters like the Eastern Arabic numerals              Use    0-9     to restrict matches to just the Arabic numerals 0 - 9     If you need to include any numeric representations other than just digits  like decimal values for starters   then see  tchrist s comprehensive guide to parsing numbers with regular expressions

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If you need to check if all the digits are number  0-9  or not     0-9      1425 TRUE  0142 TRUE  0 TRUE  1 TRUE  154a25 FALSE  1234 3254 FALSE

[c#] Regex for numbers only

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