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— title: How does hyphenation work in TeX? category: concepts permalink: /FAQ-hyphen —

Everyone knows what hyphenation is: we see it in most books we read, and (if we're alert) will spot occasional ridiculous mis-hyphenation (at one time, British newspapers were a fertile source).

Hyphenation styles are culturally-determined, and the same language may be hyphenated differently in different countries — for example, British and American styles of hyphenation of English are very different. As a result, a typesetting system that is not restricted to a single language at a single locale needs to be able to change its hyphenation rules from time to time.

TeX uses a pretty good system for hyphenation (originally designed by Frank Liang — you may view his [Ph.D. thesis](https://tug.org/docs/liang/) online) and while it's capable of missing “sensible” hyphenation points, it seldom selects grossly wrong ones. The algorithm matches candidates for hyphenation against a set of “hyphenation patterns”. The candidates for hyphenation must be sequences of letters (or other single characters that TeX may be persuaded to think of as letters). Non-letters interrupt hyphenation; this applies to TeX's `\accent` primitive (as in “système”) just as much as the exclamation in “syst!eme”.

(Hyphenation takes place on the characters “sent to the printer”. The problem with `\accent` is avoided —in LaTeX — by the use of the [`fontenc`](https://ctan.org/pkg/fontenc) package, as discussed in “[Accented words aren't hyphenated](FAQ-hyphenaccents)”.)

Sets of hyphenation patterns are usually derived from analysis of a list of valid hyphenations (the process of derivation, using a tool called [`patgen`](https://ctan.org/pkg/patgen), is not ordinarily a sport to be played by ordinary mortals).

The patterns for the languages a TeX system is going to deal with may only be loaded when the system is installed. To change the set of hyphenation patterns recognised by a TeX-based or XeTeX system, a [partial reinstallation](FAQ-newlang) is necessary (note that [LuaTeX](FAQ-luatex) relaxes this constraint).

TeX provides two “user-level” commands for control of hyphenation: `\language` (which selects a hyphenation style), and `\hyphenation` (which gives explicit instructions to the hyphenation engine, overriding the effect of the patterns).

The ordinary LaTeX user need not worry about `\language`, since it is very thoroughly managed by the [`babel`](https://ctan.org/pkg/babel) package; use of `\hyphenation` is discussed in

the context of

[hyphenation failure](FAQ-nohyph).

3_composition/langues/cesure/comment_fonctionne_la_cesure.1528030753.txt.gz · Dernière modification: 2018/06/03 14:59 par joseph.wright
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