%string_equals_<string>_<match>%
%string_equalsIgnoreCase_<string>_<match>%
%string_contains_<string>_<match>%
%string_containsIgnoreCase_<string>_<match>%
%string_charAt_<index>_<string>%
%string_indexOf_<string>_<match>%
%string_lastIndexOf_<string>_<match>%
%string_substring_<startIndex>_<string>%
%string_substring_<startIndex>,<endIndex>_<string>%
%string_shuffle_<string>%
%string_uppercase_<string>%
%string_lowercase_<string>%
%string_sentencecase_<string>%
%string_capitalize_<string>%
%string_length_<string>%
%string_random_<string1>,<string2>,<string3>,<etc>%
%string_replaceCharacters_<configuration>_<string>%
%string_alternateuppercase_<string>%
%string_startswith_<string>_<match>%
%string_endswith_<string>_<match>%
%string_trim_<string>%
%string_occurences_count_<string>_<match>%

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View the full list of Placeholders here.