Instructions

1. Enter your Regular Expression pattern. 2. Paste the Text String you want to test against. 3. Select any desired Regex Flags (Ignore Case, Multiline, Dot All). 4. Choose the Test Mode (Find All, Find First, Replace). 5. If using 'Replace' mode, enter the Replacement String (use $1, \1, etc., for group backreferences). 6. Run the tool. The results will show matches, groups, or the replaced text in JSON format below.

Regular Expression: *

Enter the regex pattern you want to test. Use parentheses () to capture groups.

Test String: *

Ignore Case (i)

Multiline (^/$ match lines) (m)

Dot Matches All (. includes newline) (s)

Test Mode: *

Choose how to apply the regex: find all occurrences, find the first one, or perform replacements.

Replacement String:

Used only in 'Replace' mode. Use $1, $2 or \1, \2 for backreferences to captured groups. Use \g<name> for named groups.

Regular Expression Tester

Instructions

Result