Regex Replacement Generator
Preview regex pattern replacements ($1, $2) in real time.
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About Regex Replacement Generator
The Regular Expression Search & Replace Code Generator creates and tests substitution expressions (`$1`, `$<name>`, `$&`, `` $` ``, `$'`) and replacement callback functions for JavaScript (`replace()`, `replaceAll()`), Python (`re.sub()`), PHP (`preg_replace()`), and Go.
How to Use Regex Replacement Generator
Step 1
Enter your regex search pattern and replacement string template.
Step 2
Paste your sample text into the input pane.
Step 3
Review the live replaced output and generated code snippets.
Step 4
Click "Copy Replaced Text" or copy language code.
Practical Use Cases for Regex Replacement Generator
Batch Reformatting Text Data & Date Formats
Reformat dates from `MM/DD/YYYY` to ISO `YYYY-MM-DD` using regex search patterns and substitution group variables (`$3-$1-$2`).
Generating JavaScript Replacement Callback Functions
Construct conditional string replacements using custom JavaScript `(match, p1, p2) => ...` callback snippets.
Input & Output Examples
Reformatting Phone Numbers with Substitution Variables
Search: `(\d{3})(\d{3})(\d{4})` | Replace: `($1) $2-$3` | Text: "Call 8005551234""Call (800) 555-1234" | JS Code: `text.replace(/(\d{3})(\d{3})(\d{4})/g, "($1) $2-$3")`Key Features & Performance
- ✓Substitution patterns: `$1` (group index), `$<name>` (named group), `$&` (full match), `` $` `` (before match), `$'` (after match), `$$` (dollar sign).
- ✓Real-time live replacement preview with syntax highlighting.
- ✓Generates code snippets for JavaScript, Python `re.sub`, PHP `preg_replace`, and Go `regexp.ReplaceAllString`.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy replaced text and code.
Key Terminology & Definitions
Replacement Pattern Syntax
Special dollar-sign prefixed tokens (e.g. `$1`, `$&`) used in replacement strings to insert matched groups from the search pattern.
`String.prototype.replaceAll()`
A modern JavaScript method that replaces all occurrences of a pattern with a replacement string or replacement function.