How to use: From Case Insensitive Regex

From Case Insensitive Regex is a free online Text Tools tool that converts a case-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case the i flag wasn't available at the time but now is, or you need it to be case-sensitive again. e.g. [mM] 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-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case the i flag wasn't available at the time but now is, or you need it to be case-sensitive again. e.g. [mM]

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

How to use

Using From 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 · From 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 From Case Insensitive Regex helps:

  • Converts a case-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case the i flag wasn't available at the time but now is, or you need it to be case-sensitive again. e.g. [mM]

Parameters

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

FAQ

What is From Case Insensitive Regex?

From Case Insensitive Regex converts a case-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case the i flag wasn't available at the time but now is, or you need it to be case-sensitive again. e.g. [mM]. It runs entirely in your browser, so your data stays private.

Is From Case Insensitive Regex free to use?

Yes. From 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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