StringScanner#exist?

exist?(pattern)

static VALUE
strscan_exist_p(VALUE self, VALUE re)
{
    return strscan_do_scan(self, re, 0, 0, 0);
}

Looks ahead to see if the pattern exists anywhere in the string, without advancing the scan pointer. This predicates whether a scan_until will return a value.

Example

s = StringScanner.new('test string')
s.exist? /s/            # -> 3
s.scan /test/           # -> "test"
s.exist? /s/            # -> 2
s.exist? /e/            # -> nil

See also #eos? #fixed_anchor? #empty? #get_byte also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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