Check whether a string matches a regex in JS

Question

I want to use JavaScript  can be with jQuery  to do some client-side validation to check whether a string matches the regex      a-z0-9  5       Ideally it would be an expression that returned true or false    I m a JavaScript newbie  does match   do what I need  It seems to check whether part of a string matches a regex  not the whole thing

User · Answer

You can try this  it works for me     lt input type  text   onchange  CheckValidAmount this value   name  amount  required gt     lt script type  text javascript  gt      function CheckValidAmount amount                     var a         d 1 3      d 3     d        d              if amount match a               alert  matches            else          alert  does not match                     lt  script gt

User · Answer

x000D   x000D  const regExpStr       a-z0-9  5      const result   new RegExp regExpStr   g   test  Your string      here I have used  g  which means global search console log result     true if it matched  false if it doesn t x000D   x000D   x000D

User · Answer

please try this flower      a-z0-9     -  2 20    a-z0-9   -  2 20    a-z  2 9    test  abc abc abc         true

User · Answer

try      a-z d  5     test str     x000D   x000D  console log     a-z d  5     test  abc123      x000D   x000D  console log     a-z d  5     test  ab12      x000D   x000D   x000D

User · Answer

Use test   method     var term    sample1   var re   new RegExp     a-z0-9  5        if  re test term         console log  Valid      else       console log  Invalid

User · Answer

let str    ABCDEFGHIJKLMNOPQRSTUVWXYZ    let regexp     a-d  gi   console log str match regexp

User · Answer

You can use match   as well   if  str match     a-z0-9  5              alert  match         But test   seems to be faster as you can read here   Important difference between match   and test     match   works only with strings  but test   works also with integers   12345 match     a-z0-9  5           ERROR     a-z0-9  5      test 12345       true     a-z0-9  5      test null        false     Better watch out for undefined values     a-z0-9  5      test undefined      true

User · Answer

Use  youregexp  test yourString  if you only want to know whether your string matches the regexp

User · Answer

Use regex test   if all you want is a boolean result    x000D   x000D  console log     a-z0-9  5      test  abc1        false x000D   x000D  console log     a-z0-9  5      test  abc12        true x000D   x000D  console log     a-z0-9  5      test  abc123        true x000D   x000D   x000D       and you could remove the    from your regexp since you ve no need for a capture

User · Answer

Here s an example that looks for certain HTML tags so it s clear that  someregex  test   returns a boolean   if   span h 0-6  li a  i test  h3    alert  true

User · Answer

I would recommend using the execute method which returns null if no match exists otherwise it returns a helpful object   let case1       a-z0-9  5      exec  abc1    console log case1     null  let case2       a-z0-9  5      exec  pass3434    console log case2        pass3434    pass3434   index 0  input  pass3434   groups  undefined

[javascript] Check whether a string matches a regex in JS

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