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Regex for multiple spaces between words [closed]

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I need a regex that detects words inside a string. My regex works fine when the class consists of a single word, but not for multiple words.
function repl(string){
return string.replace(/<span class="[a-z\s\-\b \b]*">/ , (n)=>{
return <Symbol/>
}
}
Works:
repl('<span class='hi'>') /==> <Symbol/>
Does not work:
repl('<span class='hi hi'>')

You can simplify your expression to: /<span class=["'][a-z_\-][\w\s\-]*["']>/i
Make sure your HTML element attributes are double-quoted.
Note: Please be aware that the closing </span> tag is mandatory and should never be ommited.
const repl = (str) =>
str.replace(/<span class=["'][a-z_\-][\w\-\s]*["']>/i, () => '<Symbol />');
console.log(repl('<span class="hi">'));
console.log(repl("<span class='hi hi'>"));
console.log(repl('<span class="one two three ">'));

Regex pattern for following example test test123 [closed]

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Regex pattern for following example test test123 .first string between A-za-z and second string should be A-Za-z0-9
examples:
hello world123 (true)
123 hello123 (false)

You can use like ^[a-zA-Z]+[ ][a-zA-Z0-9]+$
function CheckValidation() {
var str = document.getElementById("txtInput").value;
var pattern = new RegExp("^[a-zA-Z]+[ ][a-zA-Z0-9]+$");
var res = pattern.test(str);
document.getElementById("para").innerHTML = res;
}
<input type="text" id="txtInput" />
<button onclick="CheckValidation()">Check</button>
<p id="para"></p>

Used the below and working fine
var pattern = new RegExp("^[a-zA-Z]+[ a-zA-Z0-9]+$");
var res = pattern.test(str);

How to allow a word that contains a banned word? [closed]

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I am creating a filtering function for my form's username input to permit the use of specific banned words.
I am currently using:
var forbiddenWords = ["c*m", "blabla", "blablabla"];
// Check for forbidden words
function isForbiddenWord(value) {
for (var i = 0; i < forbiddenWords.length; i++) {
var rgx = new RegExp(forbiddenWords[i], 'gi');
if (rgx.test(value)) {
forbiddenWord = forbiddenWords[i];
return true;
}
}
return false;
};
The first word in the array, "c*m", is for obvious reasons a banned word. If for example somebody types in the username "eat_a_c*mshot" I want it banned. If somebody else types in: incumbent_king, encumbrance, accumulate_wealth, cumbersome, im_a_scum, circumvent, sweet_cucumber and so on, I want these words to be allowed.
Is there a way to identify if such words are used and permit them, like with a regular expression or so, or I am asking too much?

You might want to try the \b delimiter - as in /\bc*m|\bc*m\b|c*m\b/. This is as good as you can get with regular expressions. As MikeC said, Natural language processing is a huge field.
Postscript: on closer inspection _ is actually a word character, so in order for the \b approach to work, you'd need to replace '_' with ' '.

Username Validation [closed]

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function validate(username) {
var reg = /^\w+([-+.]\w+)*#\w+([-.]\w+)*$/;
if(reg.test(username)) {
alert("is correct");
return true;
}
else {
return false;
}
}

Pattern requires an #
This pattern ^\w+([-+.]\w+)*#\w+([-.]\w+)*$ requires an # in your input.
It matches a#a but not someusername.
If you want to build a username regex, I suggest you can with something simple like:
^[-.\w]{2,20}$
and tweak from there.
The ^ anchor asserts that we are at the beginning of the string
[-.\w] matches one word character (letters, digits, underscores), dash or period
{2,20} matches two to 20 of these characters
The $ anchor asserts that we are at the end of the string

Regex in JavaScript replace on } with preceding character [closed]

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i have a problem creating a reg expression.
E.g.: i have the following text "This} is} a} test}"
Now i want to replace every } including any preceded character.
Is this possible in java script with Regex?
The result of this text should be.
"Thi i tes"

How about:
str.replace(/.}/g, '')

Try This,
var st = "This} is} a} test}";
var rep = st.replace(/.\}/g, "");
console.log(rep);

<script type="text/javascript">
var test = "This} is} a} test}";
var regexp = new RegExp(".}","g");
test = test.replace(regexp, "");
alert(test); //"Thi i tes"
</script>