Regex to Match Symbols -

Question

I m trying to create a Regex test in JavaScript that will test a string to contain any of these characters        amp        -           lt  gt        More Info If You re Interested     It s for a pretty cool password change application I m working on  In case you re interested here s the rest of the code   I have a table that lists password requirements and as end-users types the new password  it will test an array of Regexes and place a checkmark in the corresponding table row if it    checks out    I just need to add this one in place of the 4th item in the validation array   var validate   function password       valid   true       var validation             RegExp   a-z    test password   RegExp   A-Z    test password   RegExp   d   test password            RegExp   W     test password    RegExp   s   test password    RegExp  12345678   test password             RegExp     txtUsername   val    test password    RegExp  cisco   test password             RegExp    a-z   0-9   1 1 1   test password    password length  gt  7               each validation  function i           if this                  form table tr   eq i 1  attr  class    check            else                  form table tr   eq i 1  attr  class                    valid   false                        return valid        Yes  there s also corresponding server-side validation

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Answer    W S     Explanation This creates a character class removing the word characters  space characters  and adding back the underscore character  as underscore is a  quot word quot  character    All that is left is the special characters  Capital letters represent the negation of their lowercase counterparts   W will select all non  quot word quot  characters equivalent to   a-zA-Z0-9    S will select all non  quot whitespace quot  characters equivalent to    t n r f v    will select  quot   quot  because we negate it when using the  W and need to add it back in

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Replace all latters from any language in  A   and if you wish for example all digits to 0   return str replace     s -  -  -   g   A   replace   d g   0

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The regular expression for this is really simple   Just use a character class   The hyphen is a special character in character classes  so it needs to be first     -     amp                     lt  gt           You also need to escape the other regular expression metacharacters   Edit  The hyphen is special because it can be used to represent a range of characters   This same character class can be simplified with ranges to this      -  -  -               There are three ranges       to          to      and     to       the last string of characters can t be represented more simply with a range              Use an ACSII table to find ranges for character classes

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A simple way to achieve this is the negative set    w s   This essentially catches    Anything that is not an alphanumeric character  letters and numbers  Anything that is not a space  tab  or line break  collectively referred to as whitespace    For some reason   W S  does not work the same way  it doesn t do any filtering  A comment by Zael on one of the answers provides something of an explanation

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The string must contain at least one special character  escaping reserved RegEx characters to avoid conflict   const hasSpecial   password   gt        const specialReg   new RegExp                       amp                lt  gt               -                                    return specialReg test password

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The most simple and shortest way to accomplish this      p L  d s    u  Explanation         Match a single character not present in the list below   p L    gt  matches any kind of letter from any language   d   gt  matches a digit zero through nine   s   gt  matches any kind of invisible character        gt    and   characters   Don t forget to pass the u  unicode  flag

[javascript] Regex to Match Symbols: !$%^&*()_+|~-=`{}[]:";'<>?,./

Answer

Explanation

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