How to use: To Case Insensitive Regex

To Case Insensitive Regex is a free online Text Tools tool that converts a case-sensitive regex string into a case-insensitive regex string in case the i flag is unavailable to you. e.g. Mozilla/[0-9].[0-9] .* becomes [mM][oO][zZ][iI][lL][lL][aA]/[0-9].[0-9] .* instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.

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Description

Converts a case-sensitive regex string into a case-insensitive regex string in case the i flag is unavailable to you. e.g. Mozilla/[0-9].[0-9] .* becomes [mM][oO][zZ][iI][lL][lL][aA]/[0-9].[0-9] .*

  • Text Tools
  • Because everything is computed client-side, To Case Insensitive Regex is safe to use with sensitive data such as API keys, tokens or private logs.
Input To Case Insensitive Regex Output Runs 100% in your browser — your data never leaves your device.
To Case Insensitive Regex — Input → Output

How to use

Using To Case Insensitive Regex takes three steps:

  1. Paste your data into the input box (or load the example).
  2. Configure the options to match your target format or scenario.
  3. Copy, download or inspect the output — it updates live as you type.
How to use · To Case Insensitive Regex 1 Paste your data intothe input box (or loadthe example). 2 Configure the optionsto match your targetformat or scenario. 3 Copy, download orinspect the output —it updates live as youtype.
How to use

Run

Use cases

Common situations where To Case Insensitive Regex helps:

  • Converts a case-sensitive regex string into a case-insensitive regex string in case the i flag is unavailable to you. e.g. Mozilla/[0-9].[0-9] .* becomes [mM][oO][zZ][iI][lL][lL][aA]/[0-9].[0-9] .*

Parameters

This tool has no options — it works on the input alone.

FAQ

What is To Case Insensitive Regex?

To Case Insensitive Regex converts a case-sensitive regex string into a case-insensitive regex string in case the i flag is unavailable to you. e.g. Mozilla/[0-9].[0-9] .* becomes [mM][oO][zZ][iI][lL][lL][aA]/[0-9].[0-9] .*. It runs entirely in your browser, so your data stays private.

Is To Case Insensitive Regex free to use?

Yes. To Case Insensitive Regex is free, unlimited and works without registration or installation.

Does my data get uploaded?

No. All processing happens locally in your browser; nothing is sent to any server.

Good to know

  • Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.
  • The worked example below could not be pre-computed for this tool (threw: function is not iterable (cannot read property Symbol(Symbol.iterator))); the interactive tool above still works normally.

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