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Find and Replace Online - Text Replacer & Regex Find Replace Tool
Text Processing & Developer Tools

Find and Replace Online - Text Replacer & Regex Tool

Free find and replace online tool and text replacer with full regex find and replace support. Perform search and replace operations on any text using literal strings or regular expression replace patterns. This is the website where you can replace with regular expression using capture groups, flags, and regex replace string transformations. Ideal for mass find and replace text operations on documents, code, and CSV data. All processing is 100% client-side.

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Complete Guide to Find and Replace: Regex, Patterns & Replacements

Find and replace is one of the most fundamental text processing operations. This guide covers standard string search and replace, regular expression replace patterns, regex replacement with capture groups, and practical use cases for mass find and replace text workflows.

1. Regex Find and Replace Syntax

This website where you can replace with regular expression uses the JavaScript String.prototype.replace() method with a global RegExp, meaning all occurrences are replaced in a single pass for mass find and replace text operations.

Pattern Replacement Use Case
hello world Simple find text and replace - literal string match
\b(\w+)\b [$1] Regex find and replace - wrap all words in brackets using capture group
\d{4}-\d{2}-\d{2} [DATE] Regular expression replace string - redact all ISO dates
(\w+)\s(\w+) $2 $1 Regex replacement - swap first and second word on each match
^\s+|\s+$ (empty) Search replace regex - trim leading and trailing whitespace per line
https?://\S+ [URL] Regular expression text replacement - redact all URLs

2. Regex Replacement Special Characters in the Replace String

Replacement Token Meaning Example
$& Inserts the entire matched string Wrap match: [$&]
$1, $2, ... Captured group backreference Reorder: $2, $1
$` Text before the match Advanced string replace regexp
$' Text after the match Advanced regular expression replace string
$$ Literal dollar sign in replacement Output a $ character

3. Use Cases for Search and Replace String Utility

  • Code Refactoring: Find and replace words across large source files - rename variables, functions, or class names globally.
  • CSV Data Normalization: Replace words tool to standardize date formats, phone formats, or country codes in bulk CSV data.
  • Content Sanitization: Use the find and replace text online tool to redact PII (emails, phone numbers, SSNs) with regex patterns.
  • Template Processing: Replace placeholder tokens like {{NAME}} with actual values across a document template.
  • Log File Analysis: Use search replace regex to normalize or filter log entries for analysis.

Frequently Asked Questions

How does the regex find and replace work?
Enable the Regex mode toggle to activate regular expression replace. Your search query becomes a regex pattern evaluated with JavaScript RegExp. Use capture groups like (\w+) and reference them in the replacement using $1, $2, etc. for regex replacement transformations. All standard JavaScript regex find and replace flags (case-insensitive, multiline) are supported.
Can I do a mass find and replace on a large document?
Yes. This is a mass find and replace text tool that processes the entire input in one operation. Paste any size document and all occurrences of the search string will be replaced at once. The replacement count shows exactly how many substitutions were made.
What is the difference between find and replace vs regex find and replace?
Standard find text and replace performs a literal string match and replaces all exact occurrences. Regex find and replace (regular expression find replace) uses pattern matching, allowing you to find text by structure rather than exact value, use capture groups for complex transformations, and do things like replace all words matching a pattern or reorder parts of a string.
Can I use this as a website where I can replace with regular expression?
Yes. This is a website where you can replace with regular expression. Enable Regex mode, enter your search pattern (e.g., \b\d{4}\b to match 4-digit numbers), and enter a replacement string. Use $& for the full match or $1, $2 for captured groups. Click Replace All to apply the regular expression replace to your entire text.
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