JavaScript Regex - How to Use Regular Expressions in JavaScript
JavaScript Regular Expressions
- A regular expression is a order of characters that forms to get the search pattern.
- The search pattern can be used for search and replace the text.
Sample Code
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript String Methods</h1>
<p id="para1"></p>
<p id="para2">welcome to wikitechy</p>
<script>
let text = "Visit kaashiv";
document.getElementById("para1").innerHTML = text.search("kaashiv");
let text1 = document.getElementById("para2").innerHTML;
document.getElementById("para2").innerHTML = text1.replace(/wikitechy/i,"kaashiv");
</script>
</body>
</html>
Output
JavaScript String Methods
6
welcome to kaashiv| Modifier | Description |
|---|---|
| i | Used for case-insensitive matching |
| g | Used for global match find all matches rather than stopping after the first match |
| m | Used for multi-line matching |
| Modifier | Description |
|---|---|
| [abc] | Find any of the characters between the brackets |
| [0-9] | Find any of the digits between the brackets |
| (x|y) | Find any of the alternatives separated with | |
| Modifier | Description |
|---|---|
| \d | Used for finding the digit |
| \s | Used to find whitespace character |
| \b | Finding a match at the starting of a word like this: \bJAVASCRIPT, or at the ending of a word like this: JAVASCRIPT\b |
| \uxxxx | Used for findinf the Unicode character that specified by the hexadecimal number xxxx |