texlive-xstring Subpackage of texlive

The package provides macros for manipulating strings -- testing a string's contents, extracting substrings, substitution of substrings and providing numbers such as string length, position of, or number of recurrences of, a substring. The package works equally in Plain TeX and LaTeX (though e-TeX is always required). The strings to be processed may contain (expandable) macros.

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