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get a list of the matched backreferences

LDIL

Hello all.

Let's say I have a regular expression, which string is: "(a+)b*(c+)"

How can I get a list of the matched?

Preferably something independent of the number of backreferences.

Parents

  • I was asked a very similar question by a colleague back in September. I thought it was a somewhat unusual request then, but here's what I put together at the time:

    procedure(abPcreGroups(pattern candidate)
    let((groups)
        when(stringp(pattern)
            pattern=pcreCompile(pattern)
        )
        pcreExecute(pattern candidate)
        for(subPat 1 pcreSubpatCount(pattern)
            groups=tconc(groups pcreSubstitute(pattern lsprintf("\\%d" subPat)))
        )
        car(groups)
    )
)

    To use:

    > abPcreGroups("(a+)b*(c+)" "aaabbcc")
    ("aaa" "cc")

    Andrew

Reply

  • I was asked a very similar question by a colleague back in September. I thought it was a somewhat unusual request then, but here's what I put together at the time:

    procedure(abPcreGroups(pattern candidate)
    let((groups)
        when(stringp(pattern)
            pattern=pcreCompile(pattern)
        )
        pcreExecute(pattern candidate)
        for(subPat 1 pcreSubpatCount(pattern)
            groups=tconc(groups pcreSubstitute(pattern lsprintf("\\%d" subPat)))
        )
        car(groups)
    )
)

    To use:

    > abPcreGroups("(a+)b*(c+)" "aaabbcc")
    ("aaa" "cc")

    Andrew

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