Regex.ai

Freemium

A tool to find matching regular expressions.

Regex.ai is an AI-powered regular expression solver that automates pattern matching. Users insert text and highlight specific strings to generate matching regex patterns. It includes a 4000-character limit and interactive selection tools for developers and data professionals needing to extract specific text formats (verified: 2026-01-29).

Jan 29, 2026
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Pricing: Freemium
Last verified: Jan 29, 2026
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Key facts

Pricing

Freemium

Use cases

Developers generating regular expressions by highlighting specific text patterns within a provided dataset for automated pattern matching (verified: 2026-01-29), Data analysts extracting email addresses or identifiers from unstructured text blocks using AI-driven pattern recognition (verified: 2026-01-29), Software engineers refining regex patterns by adding or removing highlighted text selections within the tool interface (verified: 2026-01-29)

Strengths

The tool processes up to 4000 characters of input text to identify and generate matching regular expression patterns (verified: 2026-01-29), Users select multiple strings by dragging the cursor which enables the AI to identify the correct regular expression (verified: 2026-01-29), The interface provides a click-to-remove feature for highlighted text to adjust the parameters for regex generation (verified: 2026-01-29)

Limitations

The input text field has a strict maximum capacity of 4000 characters per processing session (verified: 2026-01-29), The tool requires manual cursor interaction to highlight text strings before it generates any regular expressions (verified: 2026-01-29)

Last verified

Jan 29, 2026

Strengths

  • The tool processes up to 4000 characters of input text to identify and generate matching regular expression patterns (verified: 2026-01-29)
  • Users select multiple strings by dragging the cursor which enables the AI to identify the correct regular expression (verified: 2026-01-29)
  • The interface provides a click-to-remove feature for highlighted text to adjust the parameters for regex generation (verified: 2026-01-29)

Limitations

  • The input text field has a strict maximum capacity of 4000 characters per processing session (verified: 2026-01-29)
  • The tool requires manual cursor interaction to highlight text strings before it generates any regular expressions (verified: 2026-01-29)

FAQ

How does the tool identify the specific regular expressions a user needs for their data?

Users insert text into the input field and drag the cursor to highlight specific strings. The AI analyzes these manual highlights to find and generate the matching regular expression patterns for the selected examples (verified: 2026-01-29).

What is the maximum amount of text that the tool processes in a single session?

The tool supports a maximum of 4000 characters in the text input area. This character limit defines the scope of text the AI uses to generate corresponding regular expressions based on user highlights (verified: 2026-01-29).

What actions are available if a user highlights the wrong part of the text?

The interface includes a feature where clicking on highlighted text removes it from the selection. This allows the user to correct mistakes and refine the data used for generating the regular expression (verified: 2026-01-29).