String Filters

Filters for transforming and manipulating text strings.

Case Transformation

Filter	Description
upper	Convert to uppercase
lower	Convert to lowercase
title	Convert to title case
capitalize	Capitalize first letter, lowercase rest

{{ post.title|upper }}          <!-- HELLO WORLD -->
{{ post.title|lower }}          <!-- hello world -->
{{ post.title|title }}          <!-- Hello World -->
{{ post.title|capitalize }}     <!-- Hello world -->

Trimming

Filter	Arguments	Description
trim	chars, side	Remove characters from string

Arguments:

• chars — Characters to trim (default: whitespace)
• side — 'both' (default), 'left', or 'right'

{{ post.title|trim }}                  <!-- Remove whitespace -->
{{ post.title|trim('/') }}             <!-- Remove slashes -->
{{ post.title|trim(' ', 'left') }}     <!-- Trim left only -->
{{ post.title|trim(' ', 'right') }}    <!-- Trim right only -->

Truncation

Filter	Arguments	Description
truncate	length, suffix, preserve	Limit string length

Arguments:

• length — Maximum characters (default: 80)
• suffix — Append to truncated text (default: '...')
• preserve — Preserve whole words (default: true)

{{ post.excerpt|truncate(100) }}
{{ post.excerpt|truncate(100, '...') }}
{{ post.excerpt|truncate(100, '...', true) }}
{{ post.excerpt|truncate(100, '', false) }}

Excerpt

Filter	Arguments	Description
excerpt	words, more	Trim to word count
excerpt_chars	chars, more	Trim to character count

excerpt Arguments:

• words — Number of words (default: 50)
• more — Suffix text (default: '…')

excerpt_chars Arguments:

• chars — Number of characters (default: 60)
• more — Suffix text (default: '…')

{{ post.content|excerpt }}             <!-- 50 words -->
{{ post.content|excerpt(25) }}         <!-- 25 words -->
{{ post.content|excerpt(25, '...') }}

{{ post.content|excerpt_chars(200) }}
{{ post.content|excerpt_chars(200, '...') }}

HTML Processing

Filter	Arguments	Description
striptags	allowed	Remove HTML tags
nl2br	—	Convert newlines to <br> tags
spaceless	—	Remove whitespace between HTML tags
pretags	—	Escape HTML inside <pre> tags

{{ post.content|striptags }}           <!-- Remove all tags -->
{{ post.content|striptags('<p><a>') }} <!-- Keep p and a tags -->
{{ text|nl2br }}                        <!-- Newlines to <br> -->
{{ html|spaceless }}                   <!-- Remove tag whitespace -->

Text Manipulation

Filter	Arguments	Description
replace	search, replace or {map}	Replace text
split	delimiter, limit	Split into array
slug	separator	Create URL-friendly slug
sanitize	separator	Alias for slug

replace formats:

• Simple: replace('old', 'new')
• Map: replace({'%name%': 'World', '%age%': '30'})

{{ post.title|replace('old', 'new') }}
{{ post.title|replace({'%name%': user.name}) }}
{{ 'red,green,blue'|split(',') }}
{{ 'one,two,three,four'|split(',', 3) }}
{{ post.title|slug }}                  <!-- hello-world -->
{{ post.title|slug('_') }}             <!-- hello_world -->

Formatting

Filter	Arguments	Description
format	...values	sprintf-style formatting
url_encode	—	URL encode string
relative	—	Convert absolute URL to relative

{{ '%s has %d posts'|format(user.name, count) }}
{{ search_query|url_encode }}
{{ post.link|relative }}               <!-- /2024/01/post-slug/ -->