subparse: Allow newlines/whitespace at the beginning of subrip files
For example the Sintel subtitles have this and without this change they're detected as text/plain and not usable as subtitles. The parser itself already handles this just fine.
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@ -1244,7 +1244,8 @@ gst_sub_parse_data_format_autodetect_regex_once (GstSubParseRegex regtype)
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}
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break;
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case GST_SUB_PARSE_REGEX_SUBRIP:
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result = (gpointer) g_regex_new ("^ {0,3}[ 0-9]{1,4}\\s*(\x0d)?\x0a"
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result = (gpointer)
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g_regex_new ("^[\\s\\n]*[\\n]? {0,3}[ 0-9]{1,4}\\s*(\x0d)?\x0a"
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" ?[0-9]{1,2}: ?[0-9]{1,2}: ?[0-9]{1,2}[,.] {0,2}[0-9]{1,3}"
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" +--> +[0-9]{1,2}: ?[0-9]{1,2}: ?[0-9]{1,2}[,.] {0,2}[0-9]{1,2}",
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G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &gerr);
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