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s.el Build Status Coverage Status

The long lost Emacs string manipulation library.


It's available on marmalade and Melpa:

M-x package-install s

Or you can just dump s.el in your load path somewhere.


[[ function-list ]]

Documentation and examples

[[ function-docs ]]

What's with the built-in wrappers?

Imagine looking through the function list and seeing s-ends-with?, but s-starts-with? is nowhere to be found. Why? Well, because Emacs already has string-prefix-p. Now you're starting out slightly confused, then have to go somewhere else to dig for the command you were looking for.

The wrapping functions serve as both documentation for existing functions and makes for a consistent API.

Other string related libraries

  • inflections package provides functions for strings pluralization and singularization.

  • levenshtein package provides a function to calculate the Levenshtein distance between two strings.

  • string-utils is another general string manipulation library.


From 1.11.0 to 1.12.0

  • Alias all functions ending in ? (Tianxiang Xiong)
  • Add s-blank-str? (Aborn Jiang)
  • Several bugfixes

From 1.10.0 to 1.11.0

  • Add s-matched-positions-all (ono hiroko)

From 1.9.0 to 1.10.0

  • Add s-wrap (Johan Andersson)
  • Add s-split-up-to (Matus Goljer)
  • Fix s-reverse for Unicode combining characters. (Christopher Wellons)

From 1.8.0 to 1.9.0

  • Add s-count-matches (Lars Andersen)

From 1.7.0 to 1.8.0

  • Add s-present? and s-present? (Johan Andersson)
  • Better handling of international characters

From 1.6.0 to 1.7.0

  • Add s-word-initials (Sylvain Rousseau)
  • Better handling of camel cased strings (@Bruce-Connor)

From 1.5.0 to 1.6.0

  • Add s-pad-left and s-pad-right
  • Bugfixes for s-format (Nic Ferrier)

From 1.4.0 to 1.5.0

  • Add s-all-match-strings (Geoff Gole)
  • Add s-lex-format (Nic Ferrier)

From 1.3.1 to 1.4.0

  • Add s-capitalized?
  • Add s-replace-all
  • Add s-slice-at
  • Add s-split alias for split-string (Rüdiger Sonderfeld)
  • Add s-less? predicate (Rüdiger Sonderfeld)
  • Add START parameter to s-matches? (Rüdiger Sonderfeld)
  • Bugfixes

From 1.3.0 to 1.3.1

  • Add s-numeric?
  • Add s-match (Arthur Andersen)
  • Add s-format (Nic Ferrier)
  • Move .el files out of root to avoid problems with require.

From 1.2.1 to 1.3.0

  • Breaking change: s-capitalize now converts the first word's first character to upper case and the rest to lower case. s-titleize works like the old s-capitalize and capitalizes each word. (Johan Andersson)

  • s-capitalized-words and s-titleized-words mirror this change.




Yes, please do. Pure functions in the string manipulation realm only, please. There's a suite of tests in dev/examples.el, so remember to add tests for your function, or I might break it later.

You'll find the repo at:

Run the tests with


Create the docs with


I highly recommend that you install these as a pre-commit hook, so that the tests are always running and the docs are always in sync:

cp .git/hooks/pre-commit

Oh, and don't edit directly, it is auto-generated. Change or examples-to-docs.el instead.


Copyright (C) 2012-2015 Magnar Sveen

Authors: Magnar Sveen Keywords: strings

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see