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instance method

StringScanner#pre_match

pre_match

static VALUE
strscan_pre_match(VALUE self)
{
    struct strscanner *p;

    GET_SCANNER(self, p);
    if (! MATCHED_P(p)) return Qnil;
    return extract_range(p,
                         0,
                         adjust_register_position(p, p->regs.beg[0]));
}

Returns the pre-match (in the regular expression sense) of the last scan.

Example

s = StringScanner.new('test string')
s.scan(/\w+/)           # -> "test"
s.scan(/\s+/)           # -> " "
s.pre_match             # -> "test"
s.post_match            # -> "string"

See also #post_match #reset #pos= #rest also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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