JavaScript - Use variable in string match

Question

I found several similar questions  but it did not help me  So I have this problem   var xxx    victoria   var yyy    i   alert xxx match yyy g  length     I don t know how to pass variable in match command  Please help  Thank you

User · Answer

You have to use RegExp object if your pattern is string

var xxx = "victoria";
var yyy = "i";
var rgxp = new RegExp(yyy, "g");
alert(xxx.match(rgxp).length);

If pattern is not dynamic string:

var xxx = "victoria";
var yyy = /i/g;
alert(xxx.match(yyy).length);

User · Answer

Although the match function doesn t accept string literals as regex patterns  you can use the constructor of the RegExp object and pass that to the String match function   var re   new RegExp yyy   g    xxx match re     Any flags you need  such as  g  can go into the second parameter

User · Answer

For example   let myString    Hello World  let myMatch   myString match  H     console log myMatch    Or  let myString    Hello World  let myVariable    H  let myReg   new RegExp myVariable         let myMatch   myString match myReg  console log myMatch

User · Answer

Example   To find number of vowels within the string  var word  Web Development Tutorial   var vowels   aeiou     var re   new RegExp vowels   gi    var arr   word match re   document write arr length

User · Answer

xxx match yyy   g   length

User · Answer

for me anyways  it helps to see it used  just made this using the  re  example   var analyte data    sample-  sample id  var storage keys     jStorage index    var re   new RegExp  analyte data  g      for i 0 i lt storage keys length i           if storage keys i  match re             console log storage keys i            var partnum   storage keys i  split  -   2

[javascript] JavaScript - Use variable in string match

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