Python Programming for Biology: Bioinformatics and Beyond

Method

Description

group(id)

or

group(id1, id2)

Gives the substring matched by a group given one or more

group identifiers (typically numbers from 1). No identifier or

an identifier of 0 gives the whole matched substring.

groups(nullMatch)

Gives all the substring matches back as a tuple. The optional

argument allows a value to be specified for pattern groups

that legitimately match nothing, otherwise these give None.

start(id)

The start position of a given group within the queried string.

end(id)

The end position of a given group within the queried string.

span(id)

The start and end positions of a given group within the

queried string.

1

And in practice it is often best to use the Python module email to deal with this sort of

thing.

2

 This  can  also  be  done  with  the  re.I  flag  for  case-insensitive  searching,  but  that  would

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also match “gReen” etc.

3

 Note  that  the  first  argument  to  sub()  is  the  substring  replacement  and  the  second

argument is the string being modified.

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