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36 lines
811 B
36 lines
811 B
6 years ago
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Utils for re module
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"""
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from rebulk.remodule import re
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def build_or_pattern(patterns, name=None, escape=False):
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"""
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Build a or pattern string from a list of possible patterns
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:param patterns:
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:type patterns:
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:param name:
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:type name:
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:param escape:
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:type escape:
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:return:
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:rtype:
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"""
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or_pattern = []
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for pattern in patterns:
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if not or_pattern:
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or_pattern.append('(?')
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if name:
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or_pattern.append('P<' + name + '>')
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else:
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or_pattern.append(':')
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else:
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or_pattern.append('|')
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or_pattern.append('(?:%s)' % re.escape(pattern) if escape else pattern)
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or_pattern.append(')')
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return ''.join(or_pattern)
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