javascript regex for special characters

Question

I m trying to create a validation for a password field which allows only the a-zA-Z0-9 characters and         amp      -   I can t seem to get the hang of it   What s the difference when using regex    a-zA-Z0-9 g and regex     a-zA-Z0-9   and which chars from         amp      -  are needed to be escaped   What I ve tried up to now is   var regex    a-zA-Z0-9          amp          - g   but with no success

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Regex for special symbols  var regex symbols    -     amp                     lt  gt

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What s the difference      a-zA-Z0-9   is a character class which matches one character that is inside the class  It consists of three ranges    a-zA-Z0-9  does mean the literal sequence of those 9 characters      Which chars from         amp      -  are needed to be escaped    Inside a character class  only the minus  if not at the end  and the circumflex  if at the beginning   Outside of a charclass          have a special meaning and need to be escaped to match literally      allows only the a-zA-Z0-9 characters and         amp      -    Put them in a character class then  let them repeat and require to match the whole string with them by anchors   var regex      a-zA-Z0-9        amp        -

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You can use this to find and replace any special characters like in Worpress s slug const regex              amp    -                   quot   g let slug   label replace regex

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You can be specific by testing for not valid characters  This will return true for anything not alphanumeric and space   var specials      A-Za-z 0-9  g  return specials test input val

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Complete set of special characters                   amp               lt   gt                          -  g   To answer your question   var regular expression      A-Za-z0-9              amp             -    g

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a sleaker way to match special chars     W   g    W Matches any character that is not a word character  alphanumeric  amp  underscore     Underscore is considered a special character so add boolean to either match a special character or

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There are some issue with above written Regex   This works perfectly     a-zA-Z d -    s      Only allowed special characters are included here and can be extended after comma

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this is the actual regex only match     -     amp                lt  gt          g

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How about this -  var regularExpression           0-9               amp     a-zA-Z0-9       amp    6        It will allow a minimum of 6 characters including numbers  alphabets  and special characters

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Regex for minimum 8 char  one alpha  one numeric and one special char           A-Za-z        d              amp     A-Za-z d       amp    8

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This regex works well for me to validate password            amp       -     lt   gt                    This list of special characters  including white space and punctuation  was taken from here  https   www owasp org index php Password special characters  It was changed a bit  cause backslash       and closing bracket       had to be escaped for proper work of the regex  That s why two additional backslash characters were added

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var regex      a-zA-Z0-9          amp          -    g   Should work  Also may want to have a minimum length i e  6 characters  var regex      a-zA-Z0-9          amp          -  6    g

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function nameInput limitField      LimitFile here is a text input and this function is passed to the text  onInput var inputString   limitField value     here we capture all illegal chars by adding a   inside the class     And overwrite them with     var newStr   inputString replace    a-zA-Z- -    g       limitField value   newStr      This function only allows alphabets  both lower case and upper case and - and   characters  May help you build yours

[javascript] javascript regex for special characters

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