Regular Expression Tester
Enter regular expression and text, quickly match and highlight results
Regular Expression Configuration
Match Results
Please enter a regular expression and test text, then click "Execute Match"
Match Details
Highlighted Text
Usage Instructions
Enter Regular Expression
Enter the pattern you want to match in the regular expression input box. Use the flag checkboxes to set matching options.
Enter Test Text
Enter the text content you want to match against in the test text box.
Execute Match
Click the "Execute Match" button, and the system will perform regular expression matching on the text.
View Results
After matching is complete, you can view match statistics, match details, and highlighted match results.
Regular Expression Basics
What is a Regular Expression?
A regular expression is a pattern used to match character combinations in strings, commonly used for text search, replacement, and validation operations. It forms a rule to describe the characteristics of strings through the combination of special and ordinary characters.
Common Regex Flags
Find all matches instead of stopping after the first match
Do not distinguish between uppercase and lowercase letters when matching
^ and $ match the start and end of each line
. matches any character including newlines
Common Regex Metacharacters
Matches any character except newlines
Matches the preceding character zero or more times
Matches the preceding character one or more times
Matches the preceding character zero or one time
Matches the start of the string
Matches the end of the string
Regex Optimization
- Avoid greedy quantifiers, use the non-greedy forms
*?,+?,??instead of*,+,? - Use non-capturing groups
(?:pattern)instead of capturing groups to reduce memory usage - Minimize backtracking, use specific character classes instead of wildcards
- For complex matching, consider tokenization processing to avoid overly complex single expressions
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Online Regex Tester
Regex matching tools are usually used to search for and replace text that matches a certain pattern (rule). This website mainly allows programmers to test regular expressions online, save correct matches, and view them at any time.