How to remove numbers from a string

Question

I want to remove numbers from a string   questionText    1 ding      I want to replace the number 1 number and the question mark    It can be any number  I tried the following non-working code    questionText replace   0-9  g

User · Answer

String are immutable  that s why questionText replace   0-9  g       on it s own does work  but it doesn t change the questionText-string  You ll have to assign the result of the replacement to another String-variable or to questionText itself again   var cleanedQuestionText   questionText replace   0-9  g         or in 1 go  using  d   see Kobi s answer     questionText     1 ding     replace   d  g        and if you want to trim the leading  and trailing  space s  while you re at it    questionText     1 ding     replace   d    s   s   g

User · Answer

You can use  match  amp  amp  join   methods   match   returns an array and  join   makes a string  function digitsBeGone str     return str match   D g  join

User · Answer

Very close  try   questionText   questionText replace   0-9  g         replace doesn t work on the existing string  it returns a new one  If you want to use it  you need to keep it  Similarly  you can use a new variable   var withNoDigits   questionText replace   0-9  g         One last trick to remove whole blocks of digits at once  but that one may go too far   questionText   questionText replace   d  g

User · Answer

Just want to add since it might be of interest to someone  that you may think about the problem the other way as well  I am not sure if that is of interest here  but I find it relevant   What I mean by the other way is to say  strip anything that aren t what I am looking for  i e  if you only want the  ding  you could say   var strippedText     1 ding     replace    a-zA-Z  g        Which basically mean  remove anything which is nog a b c d    Z  any letter

User · Answer

This can be done without regex which is more efficient   var questionText    1 ding    var index   0  var num       do       num    questionText index     while  questionText   index   gt    0   amp  amp  questionText index   lt    9    questionText   questionText substring num length     And as a bonus  it also stores the number  which may be useful to some people

User · Answer

A secondary option would be to match and return non-digits with some expression similar to     D  g   which would likely work for that specific string in the question  1 ding       Demo  Test   x000D   x000D  function non digit string str    x000D   const regex     D  g  x000D   let m  x000D   x000D   non digit arr       x000D   while   m   regex exec str       null    x000D       This is necessary to avoid infinite loops with zero-width matches x000D    if  m index     regex lastIndex    x000D     regex lastIndex    x000D      x000D   x000D   x000D    m forEach  match  groupIndex    gt    x000D     if  match trim            x000D      non digit arr push match trim     x000D       x000D        x000D     x000D   return non digit arr  x000D    x000D   x000D  const str    1 ding   124 x000D  12 ding   x000D  123 ding   123   x000D  console log non digit string str    x000D   x000D   x000D      If you wish to simplify modify explore the expression  it s been explained on the top right panel of regex101 com  If you d like  you can also watch in this link  how it would match against some sample inputs     RegEx Circuit  jex im visualizes regular expressions

User · Answer

You re remarkably close   Here s the code you wrote in the question   questionText replace   0-9  g         The code you ve written does indeed look at the questionText variable  and produce output which is the original string  but with the digits replaced with empty string   However  it doesn t assign it automatically back to the original variable  You need to specify what to assign it to   questionText   questionText replace   0-9  g

[javascript] How to remove numbers from a string?

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