Flask是否在其URL路由中支持正则表达式？

Question

我知道Flask有int,float和path转换器,但我们开发的应用程序在其URL中有更复杂的模式.

有没有办法可以使用正则表达式,就像Django一样？

Answer 1

尽管Armin用一个公认的答案打败了我,我想我会展示一个简短的例子,说明我是如何在Flask中实现一个正则表达式匹配器的,以防万一有人想要一个如何做到这一点的工作示例.

from flask import Flask
from werkzeug.routing import BaseConverter

app = Flask(__name__)

class RegexConverter(BaseConverter):
    def __init__(self, url_map, *items):
        super(RegexConverter, self).__init__(url_map)
        self.regex = items[0]


app.url_map.converters['regex'] = RegexConverter

@app.route('/<regex("[abcABC0-9]{4,6}"):uid>-<slug>/')
def example(uid, slug):
    return "uid: %s, slug: %s" % (uid, slug)


if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=5000)

此URL应返回200:http:// localhost:5000/abc0-foo /

这个URL应该返回404:http:// localhost:5000/abcd-foo /

Answer 2

您可以挂钩匹配任意表达式的自定义转换器:自定义转换器

from random import randrange
from werkzeug.routing import Rule, Map, BaseConverter, ValidationError

class BooleanConverter(BaseConverter):

    def __init__(self, url_map, randomify=False):
        super(BooleanConverter, self).__init__(url_map)
        self.randomify = randomify
        self.regex = '(?:yes|no|maybe)'

    def to_python(self, value):
        if value == 'maybe':
            if self.randomify:
                return not randrange(2)
            raise ValidationError()
        return value == 'yes'

    def to_url(self, value):
        return value and 'yes' or 'no'

url_map = Map([
    Rule('/vote/<bool:werkzeug_rocks>', endpoint='vote'),
    Rule('/vote/<bool(randomify=True):foo>', endpoint='foo')
], converters={'bool': BooleanConverter})

Answer 3

您还可以编写捕获所有类型的路由并在方法中执行复杂路由:

from flask import Flask
app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'], defaults={'path': ''})
@app.route('/<path:path>', methods=['GET', 'POST'])
def catch_all(path):
    return 'You want path: %s' % path

if __name__ == '__main__':
    app.run()

这将匹配任何请求.在此处查看更多详细信息:Catch-All URL.