How to remove leading zeros using C

Question

How to remove leading zeros in strings using C    For example in the following numbers  I would like to remove all the leading zeros   0001234 0000001234 00001234

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Code to avoid returning an empty string   when input is like  00000     string myStr    00012345   myStr   myStr TrimStart  0    myStr   myStr Length  gt  0   myStr    0

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Regex rx   new Regex    0   d       rx Replace  0001234      1         gt   1234  rx Replace  0001234000      1         gt   1234000  rx Replace  000      1         gt   0   TrimStart will convert this to         usage var outString   rx Replace inputString     1

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This Regex let you avoid wrong result with digits which consits only from zeroes  0000  and work on digits of any length   using System Text RegularExpressions      00123   gt  123 00000   gt  0 00000a   gt  0a 00001a   gt  1a 00001a   gt  1a 0000132423423424565443546546356546454654633333a   gt  132423423424565443546546356546454654633333a     Regex removeLeadingZeroesReg   new Regex    0     d     var strs   new string          00123        00000        00000a        00001a        00001a        0000132423423424565443546546356546454654633333a      foreach  string str in strs        Debug Print string Format   0    gt   1    str  removeLeadingZeroesReg Replace str             And this regex will remove leading zeroes anywhere inside string   new Regex      lt   d 0     d          0000123432 d 0 p 002 3 0574 m 600           gt   123432 d 0 p 2 3 574 m 600

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return numberString TrimStart  0

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Using the following will return a single 0 when input is all 0   string s    0000000  s   int Parse s  ToString

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This is the code you need   string strInput    0001234   strInput   strInput TrimStart  0

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It really depends on how long the NVARCHAR is  as a few of the above  especially the ones that convert through IntXX  methods will not work for   String s    005780327584329067506780657065786378061754654532164953264952469215462934562914562194562149516249516294563219437859043758430587066748932647329814687194673219673294677438907385032758065763278963247982360675680570678407806473296472036454612945621946     Something like this would  String s   0000058757843950000120465875468465874567456745674000004000  TrimStart new Char      0          s    58757843950000120465875468465874567456745674000004000

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TryParse works if your number is less than Int32 MaxValue  This also gives you the opportunity to handle badly formatted strings  Works the same for Int64 MaxValue and Int64 TryParse   int number  if Int32 TryParse nvarchar  out number           etc       number ToString

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I just crafted this as I needed a good  simple way  If it gets to the final digit  and if it is a zero  it will stay  You could also use a foreach loop instead for super long strings  I just replace each leading oldChar with the newChar   This is great for a problem I just solved  after formatting an int into a string         Like this         int counterMax   1000      int counter            string counterString   counter ToString   quot D counterMax ToString   Length  quot        counterString   RemoveLeadingChars  0        counterString       string fullCounter     quot   counterString   counterMax   quot                1 1000        430 1000       1000 1000        static string RemoveLeadingChars char oldChar  char newChar  char   chars                string result    quot  quot           bool stop   false          for  int i   0  i  lt  chars Length  i                          if  i     chars Length - 1   stop   true              if   stop  amp  amp  chars i     oldChar  chars i    newChar              else stop   true              result    chars i                     return result             static string RemoveLeadingChars char oldChar  char newChar  string text                return RemoveLeadingChars oldChar  newChar  text ToCharArray            I always tend to make my functions suitable for my own library  so there are options

[c#] How to remove leading zeros using C#

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