method

exist?

v1_8_7_72 - Show latest stable - 0 notes - Class: StringScanner

exist?(p1) public

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.

  s = StringScanner.new('test string')
  s.exist? /s/            # -> 3
  s.scan /test/           # -> "test"
  s.exist? /s/            # -> 6
  s.exist? /e/            # -> nil

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/*
 * call-seq: exist?(pattern)
 *
 * 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.
 *
 *   s = StringScanner.new('test string')
 *   s.exist? /s/            # -> 3
 *   s.scan /test/           # -> "test"
 *   s.exist? /s/            # -> 6
 *   s.exist? /e/            # -> nil
 */
static VALUE
strscan_exist_p(VALUE self, VALUE re)
{
    return strscan_do_scan(self, re, 0, 0, 0);
}

exist?

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