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74 lines
3.1 KiB
Markdown
74 lines
3.1 KiB
Markdown
---
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layout: post
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title: Integration with regex101.com
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excerpt: Create/edit format files using regex101.com
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---
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*(This change will be in the upcoming v0.11.0 release)*
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Creating and updating format files for **lnav** can be a bit tedious and
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error-prone. To help streamline the process, an integration with regex101.com
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has been added. Now, you can create regular expressions for plaintext log
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files on https://regex101.com and then create a skeleton format file with a
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simple command. If you already have a format file that needs to be updated,
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you can push the regexes up to regex101, edit them with their interface, and
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then pull the changes back down as a format patch file.
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To further improve the experience of developing with format files, there is
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also work underway to improve error messages. Many messages should be clearer,
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more context is provided, and they should look nicer as well. For example, the
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following error is displayed when a format regex is not valid:
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## Management CLI
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The regex101 integration can be accessed through the new "management-mode CLI".
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This mode can be accessed by passing `-m` as the first option to **lnav**. The
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management CLI is organized as a series of nested commands. If you're not sure
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what to do at a given level, run the command as-is and the CLI should print out
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help text to guide you through the hierarchy of commands and required
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parameters.
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### Create a format from a regular expression
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The `regex101 import` command can be used to import a regular expression from
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regex101.com and create or patch a format file. The command takes the URL of
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the regex, the format name, and the name of the regex in the log format (
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defaults to "std" if not given). For example, the following command can be used
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to import the regex at "https://regex101.com/r/zpEnjV/2" into the format named "
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re101_example_log":
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```console
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$ lnav -m regex101 import https://regex101.com/r/zpEnjV/2 re101_example_log
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```
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If the import was successful, the path to the skeleton format file will be
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printed. You will most likely need to edit the file to fill in more details
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about your log format.
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### Editing an existing regular expression
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If you have a log format with a regex that needs to be updated, you can push
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the regex to regex101.com for editing with a command like (replace
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"myformat_log"/"std" with the name of your format and regex):
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```console
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$ lnav -m format myformat_log regex std regex101 push
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```
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Along with the regex, the format's samples will be added to the entry to ensure
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changes won't break existing matches. If the push was successful, the URL for
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the new regex101.com entry will be printed out. You can use that URL to edit the
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regex to your needs. Once you're done editing the regex, you can pull the
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changes down to a "patch" file using the following command:
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```console
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$ lnav -m format myformat_log regex std regex101 pull
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```
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The patch file will be evaluated after the original format file and override
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the values from the original. Once you are satisfied with the changes, you
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can move the contents of the patch file to the original file and delete the
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patch.
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