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Showing content from https://webplatform.github.io/docs/javascript/RegExp/test below:

test · WebPlatform Docs

test Summary

Returns a Boolean value that indicates whether or not a pattern exists in a searched string.

Syntax

rgExp.test( str )

rgExp: Required. An instance of a Regular Expression object containing the regular expression pattern and applicable flags.
str: Required. The string on which to perform the search.

Examples

The following example illustrates the use of the test method. To use this example, pass the function a regular expression pattern and a string. The function will test for the occurrence of the regular expression pattern in the string and return a string indicating the results of that search:

function TestDemo(re, teststring)
 {
    
    var found = re.test(teststring)

    
    var s = "";
    s += "'" + teststring + "'"

    if (found)
       s += " contains ";
    else
       s += " does not contain ";

    s += "'" + re.source + "'"
    return(s);
 }

Remarks

The test method checks to see if a pattern exists within a string and returns true if so, and false otherwise.

The properties of the global RegExp object are not modified by the test method.