The basic building blocks of Regex are characters.

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Simple characters represent themselves and are exact matches in text. For example, the letter “a” will only match the letter “a” in text. They can also be used to search for a specific character in text.

The next step is special characters. Special characters are characters switzerland mobile phone number that have specific meanings and do not match other characters in the text. For example, the character “.” represents any single character in the text. The character “*” represents zero or more occurrences of a character. This makes it possible to perform broader searches.

Regex expressions can also contain character classes. Character classes, enclosed in square brackets, represent a specific set of characters. For example, “[abc]” matches any character “a”, “b”, or “c” in the text. “[0-9]” matches any digit in the text.

There are also special classes of characters. For example, “\d” represents any digit and has the same meaning as “[0-9]”. “\w” represents a word character and can represent a letter, digit, or underscore. “\s” represents a space character.


Regex expressions can be used to identify repeating patterns. “+” represents one or more occurrences of a character. “*” represents zero or more occurrences of a character. “?” represents zero or one occurrences of a character.

Regex can also be used to express alternatives and options. The expression “|”(pipe) is used to make an alternative choice between two or more patterns. For example, the expression “a|b” matches any of the characters “a” or “b” in the text.