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GitHub App that checks Pull Request titles using user-defined regular expression
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Regex Checker

A GitHub App that checks Pull Request titles with the power of user-defined regular expression. It is completely free.

Uptime Robot status Build Status Branch Coverage

Usage demo 1: Prevent certain pattern (regular expression)

DNM demo

Usage demo 2: Require certain pattern (regular expression)

Regex demo

Quick Start

To use Regex Checker, all you need to do is just as simple as:

  1. Go to
  2. Install it to your repositories
  3. Start using it!
  4. (Optional) Add config file for advanced features

Default Feature

By default, Regex Checker checks the title of every pull request and mark GitHub checks as in progress if any of the following pattern (case insensitive) is found:

  • WIP
  • DNM
  • Work in Progress
  • Do Not Merge

Advanced Features

Create a .github/regex-check.yml in your repository. This will override default settings.


# mustMatch: a string (natural language or regular expression) that
# the Pull Request title must match.
# leave it empty or comment it if you don't need it.
# You may need to have quotes wrapped around, otherwise it cannot be
# parsed correctly in yaml format.

mustMatch: "^([^:]*|[^:]+[^ ]: [A-Z0-9*].*)$"

# The above will match ` Update` or `Update README`,
# but not `` (missing space after colon) or ` update`
# (shortlog needs to begin with a capital letter)
# If you want the regular expression to match the whole title exactly, use
# ^ at the beginning and $ at the end.

# mustNotMatch: a list of strings that the Pull Request title must NOT contain
# leave it empty or comment it if you don't need it. You can have a mixed list
# of natural terms and regular expressions.

  - WIP
  - DNM
  - "^#" # regular expression that prevents hashtag at the beginning of title

# caseSensitive: whether you want your patterns to be case sensitive or not.
# In case insensitive mode, `WIP` would match `WIP`, `wip`, `Wip`, etc.
# Be careful that this might cause some unexpected match for regular expressions.

caseSensitive: true

# failureStatus: Use `in_progress` or `failure`.

failureStatus: in_progress

If you don't know about or are not familiar with regular expression, this is a great resource and tutorial.

You can use regex101 to test your regular expression online.

Development and Contributing

Setup on your own server

Regex Checker is based on Probot, a free GitHub App framework. It is running on heroku as a service 7x24 hours, so you don't need to bother installing or deploying it. However, If you do like to develop or deploy this App on your own server, refer to Probot Deployment Doc.

# Install dependencies
npm install

# Run the bot
npm start


If you have suggestions for how regex-checker could be improved, or want to report a bug, open an issue! We'd love all and any contributions.

For more, check out the Contributing Guide.


ISC © 2019 Boxuan Li

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