How to convert string to uppercase / lowercase in Jinja2?

How to convert string to uppercase / lowercase in Jinja2?

In Jinja2, which is the template engine used by Flask and other frameworks, you can convert a string to uppercase or lowercase using filters. Filters are special functions that can be applied to variables within Jinja2 templates. To convert a string to uppercase or lowercase, you can use the upper and lower filters, respectively.

Here's how you can use these filters in Jinja2:

  • Uppercase Filter (upper):
{{ "hello world" | upper }}

Output:

HELLO WORLD
  • Lowercase Filter (lower):
{{ "Hello World" | lower }}

Output:

hello world

You can also chain filters together if you need to perform multiple transformations on a string:

{{ "Hello World" | upper | replace(" ", "_") }}

Output:

HELLO_WORLD

Remember that these filters are applied within Jinja2 templates and won't modify the original variables outside of the template rendering.

Examples

  1. Convert string to uppercase in Jinja2 using upper filter:

    Description: Utilize the upper filter in Jinja2 to convert a string to uppercase.

    {{ "hello world" | upper }}

  2. Convert string to lowercase in Jinja2 using lower filter:

    Description: Utilize the lower filter in Jinja2 to convert a string to lowercase.

    {{ "HELLO WORLD" | lower }}

  3. Convert string to uppercase in Jinja2 using capitalize filter:

    Description: Utilize the capitalize filter in Jinja2 to capitalize the first character of a string and convert the rest to lowercase.

    {{ "hello world" | capitalize }}

  4. Convert string to lowercase in Jinja2 using custom filter:

    Description: Implement a custom Jinja2 filter to convert a string to lowercase.

    {% set lowercase = "hello world" | lower_custom %} {{ lowercase }}

    Custom Filter Implementation:

    from jinja2 import Environment def lower_custom(string): return string.lower() env = Environment() env.filters['lower_custom'] = lower_custom

  5. Convert string to uppercase in Jinja2 using custom filter:

    Description: Implement a custom Jinja2 filter to convert a string to uppercase.

    {% set uppercase = "hello world" | upper_custom %} {{ uppercase }}

    Custom Filter Implementation:

    from jinja2 import Environment def upper_custom(string): return string.upper() env = Environment() env.filters['upper_custom'] = upper_custom

  6. Convert string to uppercase in Jinja2 using loop and upper method:

    Description: Use a loop in Jinja2 to iterate over each character of the string and convert it to uppercase using the upper method.

    {% set uppercase = "" %} {% for char in "hello world" %} {% set uppercase = uppercase + char.upper() %} {% endfor %} {{ uppercase }}

  7. Convert string to lowercase in Jinja2 using loop and lower method:

    Description: Use a loop in Jinja2 to iterate over each character of the string and convert it to lowercase using the lower method.

    {% set lowercase = "" %} {% for char in "HELLO WORLD" %} {% set lowercase = lowercase + char.lower() %} {% endfor %} {{ lowercase }}

  8. Convert string to uppercase in Jinja2 using regex_replace filter:

    Description: Use the regex_replace filter in Jinja2 to replace each character in the string with its uppercase equivalent.

    {{ "hello world" | regex_replace("[a-z]", "\\u\\g<0>") }}

  9. Convert string to lowercase in Jinja2 using regex_replace filter:

    Description: Use the regex_replace filter in Jinja2 to replace each character in the string with its lowercase equivalent.

    {{ "HELLO WORLD" | regex_replace("[A-Z]", "\\l\\g<0>") }}

  10. Convert string to uppercase in Jinja2 using custom macro:

    Description: Define a custom Jinja2 macro to convert a string to uppercase.

    {% macro to_uppercase(string) %} {% set uppercase = "" %} {% for char in string %} {% set uppercase = uppercase + char.upper() %} {% endfor %} {{ uppercase }} {% endmacro %} {% call to_uppercase("hello world") %}

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