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## org.biojava.bio.symbol
Class MotifTools

    java.lang.Object
      org.biojava.bio.symbol.MotifTools

    public class MotifTools

extends Object

`MotifTools` contains utility methods for sequence motifs.

Author:
  Keith James

Constructor Summary
`MotifTools()`

Method Summary
`static String` | `createRegex(SymbolList motif)` `createRegex` creates a regular expression which matches the `SymbolList`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### MotifTools

    public MotifTools()

Method Detail

### createRegex

    public static String createRegex(SymbolList motif)

  `createRegex` creates a regular expression which matches the `SymbolList`. Ambiguous `Symbol`s are simply transformed into character classes. For example the nucleotide sequence "AAGCTT" becomes "A{2}GCT{2}" and "CTNNG" is expanded to "CT[ABCDGHKMNRSTVWY]{2}G". The character class is generated using the `getMatches` method of an ambiguity symbol to obtain the alphabet of `AtomicSymbol`s it matches, followed by calling `getAllSymbols` on this alphabet, removal of any gap symbols and then tokenization of the remainder. The ordering of the tokens in a character class is by ascending numerical order of their tokens as determined by `Arrays.sort(char [])`.

  The `Alphabet` of the `SymbolList` must be finite and must have a character token type. Regular expressions may be generated for any such `SymbolList`, not just DNA, RNA and protein.

  Parameters:
    `motif` - a `SymbolList`.
  Returns:
    a `String` regular expression.

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