bumpVersions matchStrings not finding match that is found by other regex checkers

[jordancarlin]

How are you running Renovate?

A Mend.io-hosted app

Which platform you running Renovate on?

GitHub.com

Which version of Renovate are you using?

41.173.1

Please tell us more about your question or problem

I'm working on a repo where I need to bump a version number stored in a file whenever one of the dependencies in the repo is updated. bumpVersions seemed like a good way to do this, but I am running into an issue that I haven't been able to figure out. Based on the logs (included below), Renovate is correctly attempting to run the bumpVersions part of the job and is finding the file that it needs to update, but it thinks there is no match for the version string. I have tested the regex pattern (with the extra backslash escapes removed) against the contents of the file with various other regex testers, and they all match the 0.10 correctly, so I'm not sure why Renovate is not finding that match. I may be misunderstanding something about how this configuration option is meant to work, but based on the documentation I believe this should be setup correctly. I've included the Renovate config file and the file containing the version string below. Any advice would be greatly appreciated.

Relevant snippet of config:

{
  "extends": ["config:recommended"],
  "packageRules": [
    {
      "matchFileNames": [
        "package.json",
        "package-lock.json",
        "requirements.txt"
      ],
      "bumpVersions": [
        {
          "name": "Updating container version",
          "filePatterns": ["bin/.container-tag"],
          "bumpType": "minor",
          "matchStrings": ["(?<version>\\d+\\.\\d+)"]
        }
      ]
    }
  ],
  "logLevelRemap": [
    {
      "matchMessage": "/bumpVersions/",
      "newLogLevel": "debug"
    }
  ],
}

Contents of bin/.container-type:

0.10

Logs (if relevant)

Logs

DEBUG: bumpVersions(Updating container version): Compiled filePatterns (branch="renovate/reuse-6.x")
{
  "dep": "reuse"
  "filePatterns": [
    "bin/.container-tag"
  ]
  "oldLevel": "trace"
}

DEBUG: bumpVersions(Updating container version): Found 1 files to bump versions (branch="renovate/reuse-6.x")
{
  "dep": "reuse"
  "files": [
    "bin/.container-tag"
  ]
  "oldLevel": "trace"
}

DEBUG: bumpVersions(Updating container version): Compiled matchStrings (branch="renovate/reuse-6.x")
{
  "dep": "reuse"
  "matchStrings": [
    "(?<version>[^\\s]+)"
  ]
  "oldLevel": "trace"
}

DEBUG: bumpVersions(Updating container version): Could not bump version (branch="renovate/reuse-6.x")
{
  "dep": "reuse"
  "file": "bin/.container-tag"
  "oldLevel": "debug"
}

DEBUG: bumpVersions(Updating container version): No match found for bumping version (branch="renovate/reuse-6.x")
{
  "dep": "reuse"
  "file": "bin/.container-tag"
  "oldLevel": "debug"
}