Remove non-ascii character in string

Question

var str  INFO                  2                      Higashikurume      and i need to remove all non-ascii character from string   means str only contain  INFO   Higashikurume

User · Answer

To use ASCII with accents   var str   str replace     x00- xFF  g

User · Answer

It can also be done with a positive assertion of removal  like this   textContent   textContent replace    u 0080 - u FFFF   gu        This uses unicode   In Javascript  when expressing unicode for a regular expression  the characters are specified with the escape sequence  u xxxx  but also the flag  u  must present  note the regex has flags  gu    I called this a  positive assertion of removal  in the sense that a  positive  assertion expresses which characters to remove  while a  negative  assertion expresses which letters to not remove   In many contexts  the negative assertion  as stated in the prior answers  might be more suggestive to the reader   The circumflex     says  not  and the range  x00- x7F says  ascii   so the two together say  not ascii    textContent   textContent replace     x00- x7F  g        That s a great solution for English language speakers who only care about the English language  and its also a fine answer for the original question   But in a more general context  one cannot always accept the cultural bias of assuming  all non-ascii is bad    For contexts where non-ascii is used  but occasionally needs to be stripped out  the positive assertion of Unicode is a better fit     A good indication that zero-width  non printing characters are embedded in a string is when the string s  length  property is positive  nonzero   but looks like  i e  prints as  an empty string   For example  I had this showing up in the Chrome debugger  for a variable named  textContent     gt  textContent     gt  textContent length 7   This prompted me to want to see what was in that string    gt  encodeURI textContent    E2 80 8B E2 80 8B E2 80 8B E2 80 8B E2 80 8B E2 80 8B E2 80 8B    This sequence of bytes seems to be in the family of some Unicode characters that get inserted by word processors into documents  and then find their way into data fields   Most commonly  these symbols occur at the end of a document   The zero-width-space   E2 80 8B  might be inserted by CK-Editor  CKEditor    encodeURI    UTF-8     Unicode  html     Meaning -----------  --------  -------  -------  -------------------   E2 80 8B   EC 80 8B  U 200B    amp  8203   zero-width-space   E2 80 8E   EC 80 8E  U 200E    amp  8206   left-to-right-mark   E2 80 8F   EC 80 8F  U 200F    amp  8207   right-to-left-mark   Some references on those   http   www fileformat info info unicode char 200B index htm  https   en wikipedia org wiki Left-to-right mark  Note that although the encoding of the embedded character is UTF-8  the encoding  in the regular expression is not   Although the character is embedded in the string as three bytes  in my case  of UTF-8  the instructions in the regular expression must use the two-byte Unicode   In fact  UTF-8 can be up to four bytes long  it is less compact than Unicode because it uses the high bit  or bits  to escape the standard ascii encoding   That s explained here   https   en wikipedia org wiki UTF-8

User · Answer

ASCII is in range of 0 to 127  so   str replace     x00- x7F  g

User · Answer

You can use the following regex to replace non-ASCII characters  str   str replace    A-Za-z 0-9                 amp       -       lt  gt                    g        However  note that spaces  colons and commas are all valid ASCII  so the result will be   gt  str  INFO           Higashikurume

User · Answer

None of these answers properly handle tabs  newlines  carriage returns  and some don t handle extended ASCII and unicode  This will KEEP tabs  amp  newlines  but remove control characters and anything out of the ASCII set  Click  Run this code snippet  button to test  There is some new javascript coming down the pipe so in the future  2020    you may have to do  u FFFFF  but not yet   x000D   x000D  console log  line 1 nline2  n ttabbed nF                      l                    a                  v        i    o                       replace    x00- x08 x0E- x1F x7F- uFFFF  g       x000D   x000D   x000D

[javascript] Remove non-ascii character in string

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