Matching special characters and letters in regex

Question

I am trying to validate a string  that should contain letters numbers and special characters  amp -   only  For that I tried with a regular expression   var pattern     a-zA-Z0-9 amp    -   var qry    abc amp     if qry match pattern         alert  valid      else      alert  invalid        While using the above code  the string abc amp   is valid  But my requirement is to show this invalid  ie Whenever a character other than a letter  a number or special characters  amp -   comes  the string should evaluate as invalid  How can I do that with a regex

User · Accepted Answer

Add them to the allowed characters  but you ll need to escape some of them  such as -     var pattern      a-zA-Z0-9       amp       -                 lt  gt           That way you can remove any individual character you want to disallow   Also  you want to include the start and end of string placemarkers   and    Update   As elclanrs understood  and the rest of us didn t  initially   the only special characters needing to be allowed in the pattern are  amp -        w amp   -         w  is the same as  a-zA-Z0-9    Though the dash doesn t need escaping when it s at the start or end of the list  I prefer to do it in case other characters are added  Additionally  the   means you need at least one of the listed characters  If zero is ok  ie an empty value   then replace it with a   instead       w amp   -

User · Answer

Try this RegEx  Matching special charecters which we use in paragraphs and alphabets     Javascript      a-zA-Z            -         a-zA-Z      a-zA-Z          test str                    test str  returns boolean value if matched true and not matched false              c       a-zA-Z            -         a-zA-Z      a-zA-Z

User · Answer

Try this regex       w amp  -       Also you can use test   if   pattern test  qry            valid

User · Answer

Well  why not just add them to your existing character class   var pattern     a-zA-Z0-9 amp   -     If you need to check whether a string consists of nothing but those characters you have to anchor the expression as well   var pattern      a-zA-Z0-9 amp   -       The added   and   match the beginning and end of the string respectively   Testing for letters  numbers or underscore can be done with  w which shortens your expression   var pattern       w amp  -       As mentioned in the comment from Nathan  if you re not using the results from  match    it returns an array with what has been matched   it s better to use RegExp test   which returns a simple boolean   if  pattern test qry            qry is non-empty and only contains letters  numbers or special characters      Update 2  In case I have misread the question  the below will check if all three separate conditions are met   if    a-zA-Z   test qry   amp  amp    0-9   test qry   amp  amp     amp   -   test qry           qry contains at least one letter  one number and one special character

User · Answer

let pattern           0-9               amp          a-z        A-Z   a-zA-Z0-9       amp    6 16        following will give you the result as true if the password contains Capital  small letter  number and special character  or false based on the string format  let reee  pattern  test  helLo123         true as it contains all the above

User · Answer

I tried a bunch of these but none of them worked for all of my tests  So I found this         d       a-z        A-Z         a-zA-Z0-9        s   8 15    from this source  https   www w3resource com javascript form password-validation php

[javascript] Matching special characters and letters in regex

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