diff --git a/onmt/transforms/filtering.py b/onmt/transforms/filtering.py
index fa7f8321..46807af1 100644
--- a/onmt/transforms/filtering.py
+++ b/onmt/transforms/filtering.py
@@ -1,5 +1,6 @@
 from onmt.transforms import register_transform
 from .transform import Transform, ObservableStats
+import regex as re
 
 class FilterTooLongStats(ObservableStats):
     """Runing statistics for FilterTooLongTransform."""
@@ -48,42 +49,6 @@ def _repr_args(self):
         """Return str represent key arguments for class."""
         return '{}={}, {}={}'.format('src_seq_length', self.src_seq_length, 'tgt_seq_length', self.tgt_seq_length)
 
-
-@register_transform(name='filtertoolong_opusfilter')
-class FilterTooLongTransformOP(Transform):
-    """Filter out sentence that are too long."""
-
-    def __init__(self, opts):
-        super().__init__(opts)
-        import opusfilter as op
-
-    @classmethod
-    def add_options(cls, parser):
-        """Avalilable options relate to this Transform."""
-        group = parser.add_argument_group("Transform/Filter")
-        group.add("--src_seq_length_op", "-src_seq_length_op", type=int, default=200, help="Maximum source sequence length.")
-        group.add("--tgt_seq_length_op", "-tgt_seq_length_op", type=int, default=200, help="Maximum target sequence length.")
-
-    def _parse_opts(self):
-        self.src_seq_length = self.opts.src_seq_length
-        self.tgt_seq_length = self.opts.tgt_seq_length
-
-    def apply(self, example, is_train=False, stats=None, **kwargs):
-        """Return None if too long else return as is."""
-        lf_src = op.filters.LengthFilter(max_length=self.src_seq_length)
-        length_src = lf_src.get_length(example['src'], 0)
-        lf_tgt = op.filters.LengthFilter(max_length=self.src_seq_length)
-        length_tgt = lf_tgt.get_length(example['tgt'], 0)
-        if lf_src.accept([length_src]) and lf_tgt.accept([length_tgt]):
-            return example
-        else:
-            return None
-
-    def _repr_args(self):
-        """Return str represent key arguments for class."""
-        return '{}={}, {}={}'.format('src_seq_length_op', self.src_seq_length, 'tgt_seq_length_op', self.tgt_seq_length)
-
-
 # Filters inspired by OpusFilter https://github.com/Helsinki-NLP/OpusFilter/blob/aca40bd064d9b087c5216de0568d7fb91a31d142/opusfilter/filters.py
 
 @register_transform(name='filterwordratio')
@@ -118,35 +83,4 @@ def apply(self, example, **kwargs):
 
     def _repr_args(self):
         """Return str represent key arguments for class."""
-        return '{}={}'.format('word_ratio_threshold', self.word_ratio_threshold)
-    
-@register_transform(name='filterwordratio_opusfilter')
-class FilterWordRatioOP(Transform):
-    """Filter out sentence based on word length ratio"""
-    
-    def __init__(self, opts):
-        super().__init__(opts)
-
-    @classmethod
-    def add_options(cls, parser):
-        """Avalilable options relate to this Transform."""
-        group = parser.add_argument_group("Transform/Filter")
-        group.add("--word_ratio_threshold_op", "-word_ratio_threshold_op", type=int, default=3, help="Threshold for discarding sentences based on word ratio.")
-        group.add("--word_ratio_unit_op", "-word_ratio_unit_op", type=str, default="word", choices=[('word', 'char', 'character')], help="Unit for discarding sentences based on char/character/word ratio.")
-
-    def _parse_opts(self):
-        self.word_ratio_threshold = self.opts.word_ratio_threshold
-        self.word_ratio_unit = self.opts.word_ratio_unit
-
-    def apply(self, example, **kwargs):
-        ratiofilter = op.filters.LengthRatioFilter(threshold=self.opts.word_ratio_threshold, unit=self.opts.word_ratio_unit)
-        score = ratiofilter.score([example['src'],example['tgt']])
-        accept = ratiofilter.accept(next(score))
-        if accept:
-            return example
-        else:
-            return None
-    
-    def _repr_args(self):
-        """Return str represent key arguments for class."""
-        return '{}={}'.format('word_ratio_threshold_op', self.word_ratio_threshold)
\ No newline at end of file
+        return '{}={}'.format('word_ratio_threshold', self.word_ratio_threshold)
\ No newline at end of file