In the template creation of AnQi CMS, we often need to process strings, wheresplitFilter is a very practical tool, which can help us split a long string into multiple parts according to a specified delimiter.However, a common issue when using this filter is: does it distinguish between uppercase and lowercase when handling delimiters?Let's delve into this issue in depth.

splitThe working principle of the filter

Firstly,splitThe core function of the filter is to receive a target string and a delimiter string used as a basis for cutting, and then split the original string into an array of strings (in Go language templates, this is usually called 'slice'). For example, if you have a string containing multiple keywords and you want to split them by comma and space,splitThe filter can be used.

The document mentions that if the specified delimiter is not found in the original string,splitThe filter returns an array containing only the original string itself, with a length of 1.In addition, if the delimiter parameter is left blank, the original string will be split according to each UTF-8 character.

Here is an example provided in the document, if you have a string"splits, the, string, 安企CMS"and you intend to use,as the separator:{{ "splits, the, string, 安企CMS"|split:", "|stringformat:"%#v" }}AftersplitFilter processed, you will get a string array containing["splits", "the", "string", "安企CMS"]these elements.

Investigate the case sensitivity of delimiters

for "Anqi CMS"splitIs the filter case-sensitive? This specific issue is not explicitly stated in the current document of Anqi CMSsplitThe filter provides a built-in parameter or option to make its delimiter case-insensitive.In all the examples provided in the document, delimiters are matched exactly as literal strings.

This means that when you use Anqi CMS templates,splitThe filter defaults to treating the delimiter string you provide as case-sensitive. For example, if you set the delimiter to"CMS"all characters matching"CMS"Only the parts that match completely will be recognized as delimiters and split; while if a string appears"cms"(lowercase) or"CmS"(mixed case), they will not besplitFilter recognized as a delimiter but retained as ordinary content in one of the split elements.

Therefore, if you need to split a string based on a word that may have different cases (for example,"Apple"/"apple"or"APPLE") in practical applications,splitThe filter cannot implement case-insensitive matching.

Strategy for case-insensitive split processing.

AlthoughsplitThe filter itself is case-sensitive, but you can implement case-insensitive string splitting with some combination strategies:

  1. Split after unifying the case of the string:This is the most commonly used and most direct method. In executionsplitUse it before the filterlowerThe filter converts the entire target string to lowercase, or usesupperFilter converted to uppercase and then used with the appropriate uppercase or lowercase delimiterssplitOperation. For example, if you want to split 'One Apple, Two apples, Three APPLEs' using 'apple' regardless of case: {% set original_string = "One Apple, Two apples, Three APPLEs" %} {% set lowercased_string = original_string|lower %} {% set parts = lowercased_string|split:"apple" %}This is,partsVariables will contain the results split by the uniform lowercase 'apple'.

  2. Split after replacing different delimiters with a uniform delimiter:If the delimiter itself may exist in multiple uppercase and lowercase forms, and you want to support them simultaneously,replaceThe filter will replace all different case variations with a standard delimiter and then proceedsplit.{% set text_data = "KeyWORD1 Value; keyword2 Value; KEYword3 Value" %} {% set standardized_text = text_data|replace:"KeyWORD,keyword"|replace:"keyword2,keyword" %} {% set parts = standardized_text|split:"; keyword " %}This method is a bit complex, but it can handle more refined uniform delimiter requirements.

make_listFilter as an auxiliary

It is worth mentioning that, Anqi CMS also provides amake_listFilter.This filter will split each UTF-8 character in the string into a separate element to form an array.An alphabet is counted as one element, and a Chinese character is also counted as one element.splitIt behaves similarly when the delimiter is empty,make_listIt focuses more on fine-grained splitting at the character level without involving any delimiter pattern matching.

Summary

In the template environment of AnQi CMS,splitFilter delimiter is case sensitive.This means that when splitting a string, you need to provide the case-sensitive form that matches the delimiter in the target string.lowerorupperThe filter will unify the case of the string or usereplaceThe filter standardizes various forms of delimiters and thensplitoperations. Mastering these techniques will help you handle strings in the CMS more flexibly and efficiently.

Common Questions (FAQ)

Q1:splitandfieldsWhat are the differences between filters?A1:splitThe filter allows you to specify any string as a delimiter to split strings.fieldsFilter is a more specific version, designed to split strings by spaces (including consecutive multiple spaces) into an array, functionally similar tosplitFilter separated by space. If your string is always separated by a single or multiple spaces, usefieldsit will be more concise.

Q2: I cansplitCan you use regular expressions as separators in the filter?A2: According to the current document description, the security CMS ofsplitThe filter accepts literal strings as delimiters and does not directly support regular expressions. If you need more complex pattern-based matching and splitting, you may consider handling it in the backend code before the data enters the template, or by combining multiplereplaceandsplitFilter to simulate some simple pattern matching effects.

Q3: If my string contains multiple different but synonymous delimiters (such as commas and semicolons),splitCan it be processed at once?A3:splitThe filter can only accept one specified delimiter string at a time. If your string contains multiple delimiters (such assplitIdentify them at the same time. The usual practice is toreplaceReplace all non-standard delimiters with the onesplityou want to identify as a unified delimiter, and thensplituse it to split. For example,{{ "Apple,Banana;Orange"|replace:";,,"|split:"," }}.