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Editorial Team
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Asked: 2026-06-10T04:46:53+00:00

I’m making a Flask app for local development (on a Mac) of HTML templates

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I’m making a Flask app for local development (on a Mac) of HTML templates that will eventually be served through ASP.NET.

For the purposes of local development, I want a way to replace the contents of .NET-style tokens with some data, meaning that Jinja2 would need to be able to recognize %% ... %% tokens in addition to the standard ones: {{ ... }}, <% ... %>, etc.

Everything I’ve found online pertains to the inclusion of some new functionality within the existing tags (e.g. {{ my_custom_function | arg1 arg2 }})

But what about defining a new pattern for tags altogether? Has anyone done this successfully? And will it require modification to the Jinja2 core?

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  1. Editorial Team

    As far as I know, you can use one set for block_start_string and block_end_string, as well as one set for variable_start_string and variable_end_string.

    From jinja2/environment.py

    `block_start_string`
    The string marking the begin of a block.  Defaults to ``'{%'``.

`block_end_string`
    The string marking the end of a block.  Defaults to ``'%}'``.

`variable_start_string`
    The string marking the begin of a print statement.
    Defaults to ``'{{'``.

`variable_end_string`
    The string marking the end of a print statement.  Defaults to
    ``'}}'``.

    You can override these with environment variables. Though, I don’t think there is a way to have multiple types recognized. For instance, you can’t have {{ and <% both work, but with a little hackery you certainly could.

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