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    Regular expressions (regex) are patterns used to match character combinations in strings. Here is a cheat sheet for common regex patterns and their meanings.

    Character Classes

    • [abc]: Matches any one of the characters a, b, or c.

    • [^abc]: Matches any character except a, b, or c.

    • [a-z]: Matches any character from a to z.

    • \d: Matches any digit (equivalent to [0-9]).

    • \D: Matches any non-digit.

    • \w: Matches any word character (alphanumeric + underscore).

    • \W: Matches any non-word character.

    • \s: Matches any whitespace character (spaces, tabs, line breaks).

    • \S: Matches any non-whitespace character.

    Anchors

    • ^: Matches the beginning of a string.

    • $: Matches the end of a string.

    • \b: Matches a word boundary.

    • \B: Matches a non-word boundary.

    Quantifiers

    • x*: Matches 0 or more occurrences of x.

    • x+: Matches 1 or more occurrences of x.

    • x?: Matches 0 or 1 occurrence of x.

    • x{n}: Matches exactly n occurrences of x.

    • x{n,}: Matches at least n occurrences of x.

    • x{n,m}: Matches between n and m occurrences of x.

    Groups and Ranges

    • (abc): Matches the exact sequence abc.

    • a|b: Matches either a or b.

    • (a|b|c): Matches either a, b, or c.

    Example

    const regex = /\d{3}-\d{2}-\d{4}/;
    const str = "My number is 123-45-6789";
    Continue reading
    Includes AI-generated content
    What is a regex pattern?
    It is used for searching and even replacing the specified text pattern. In the regular expression, a set of characters together form the search pattern. It is also known as the reg-ex pattern. The tough thing about Regex is not learning or understanding it but remembering syntax and how to form patterns according to our requirements.
    geeksforgeeks.org
    Mozilla Developer
    https://developer.mozilla.org/.../docs/Web/JavaScript/Guide/Regular…
    Regular expression syntax cheat sheet - JavaScript | MDN - MDN Web Docs
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