Replace all occurrences of a word
Input
The blue sky and blue oceanExample output
The golden sky and golden oceanFind & Replace Text
Text100% Client-SideReady
TEXT
0 lines0 chars
0 B / 4.77 MB
Read-only
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About this tool, examples & FAQ
Search and substitute text patterns across single-line or multi-line documents. Supports plain text substrings, regular expression patterns with capture groups ($1, $2), case-sensitive matching, and whole-word boundaries with 100% client-side privacy.
Key facts
| Matching Engines | Literal Text Matching & ECMAScript Regular Expressions |
|---|---|
| Search Modifiers | Case Sensitivity, Whole Word Boundaries (\b), Multiline Anchors (^, $) |
| Maximum Input | 5 MB |
| Execution Deadline | 3 s |
How to use
- Enter your search pattern in the Find Query field.
- Enter your substitution text in the Replace With field.
- Toggle Use Regular Expressions if you want regex pattern evaluation.
- Toggle Match Case or Match Whole Word Only to refine precision.
- Paste your text into the input pane and click Run (or press Ctrl/Cmd + Enter).
Examples
Reformat text using regex capture groups
Input
user: Alice, user: BobExample output
member[Alice], member[Bob]Edge cases
Literal Dollar Signs ($) in Replacement Text
When Use Regular Expressions is disabled, dollar signs ($) in the replacement text are treated as exact literal characters. When regex mode is active, $1, $2, etc., expand to matched capture groups.
Special Characters in Plain Text Searches
In plain text mode, characters like ., *, ?, +, [, and ( are automatically escaped, allowing you to find literal punctuation and file extensions without regex syntax errors.
Whole Word Boundary Matching
Enabling Match Whole Word Only ensures searching for 'cat' matches the isolated word 'cat', while ignoring 'catalog', 'concatenate', and 'scatter'.
How it works
- Parses the search query as either an escaped literal substring or a standard JavaScript RegExp instance.
- Applies the global (g), case-insensitive (i), and multiline (m) flags based on selected options.
- Performs in-memory replacement over text lines with linear time complexity.
- Executes entirely within an isolated browser Web Worker without uploading text to remote servers.
Related workflows
Regex Tester & Replacer
Test, match, and replace regular expressions with real-time capture group extraction and flag configuration.
Text & Whitespace Cleaner
Clean extra whitespace, strip blank lines, collapse consecutive spaces, and convert between multi-line lists and single-line text.
Line & Text Sorter
Sort lines of text alphabetically, numerically, by string length, deduplicate lines, reverse line order, or shuffle randomly.
Case Converter
Convert text, identifiers, and variables between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, Title Case, dot.case, and path/case.
Frequently asked questions
How do I use capture groups in replacements?
In regex mode, wrap parts of your search query in parentheses like (\w+). In the Replace field, reference them using $1 for the first group, $2 for the second group, and so forth.
Can I replace across multiple lines?
Yes. Multiline search and substitution works across paragraphs, code blocks, logs, and CSV data.
Are my documents, tokens, or scripts sent to a server?
No. All find and replace transformations run 100% client-side in your browser memory.
References
- ECMA-262 ECMAScript Language Specification: RegExp Objects — Specification for JavaScript regular expression matching and replacement substitution