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Visualize Regular Expression and Practice

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Predefined Examples

Regex Explanation

REMEMBER

```
Avoid \(.*\+\)
```
⚠️ Can cause catastrophic backtracking. Use lazy quantifiers (e.g., `.+?` instead of `.+`).
```
Avoid (a|b|c|d)
```
⚠️ Consider using a character class `[abcd]` instead of `(a|b|c|d)`, which is more efficient.

REFERENCE

```
\d
```
Matches any digit (0-9)
```
\w
```
Matches any word character (letters, digits, underscores)
```
\s
```
Matches any whitespace character (spaces, tabs, newlines)
```
\b
```
Matches a word boundary
```
.
```
Matches any character except a newline
```
\*
```
Matches 0 or more of the preceding character
```
\+
```
Matches 1 or more of the preceding character
```
\?
```
Matches 0 or 1 of the preceding character
```
\|
```
Acts as OR between patterns
```
\[.*?\]
```
Matches a character set
```
\(.*?\)
```
Groups characters together
```
{\d+,?\d*}
```
Specifies a range of repetitions