/
regexp.rs
345 lines (311 loc) · 14.6 KB
/
regexp.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use datafusion::error::Result;
use datafusion::prelude::*;
use datafusion_common::{assert_batches_eq, assert_contains};
/// This example demonstrates how to use the regexp_* functions
///
/// the full list of supported features and
/// syntax can be found at
/// https://docs.rs/regex/latest/regex/#syntax
///
/// Supported flags can be found at
/// https://docs.rs/regex/latest/regex/#grouping-and-flags
#[tokio::main]
async fn main() -> Result<()> {
let ctx = SessionContext::new();
ctx.register_csv(
"examples",
"../../datafusion/physical-expr/tests/data/regex.csv",
CsvReadOptions::new(),
)
.await?;
//
//
//regexp_like examples
//
//
// regexp_like format is (regexp_like(text, regex[, flags])
//
// use sql and regexp_like function to test col 'values', against patterns in col 'patterns' without flags
let result = ctx
.sql("select regexp_like(values, patterns) from examples")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+------------------------------------------------+",
"| regexp_like(examples.values,examples.patterns) |",
"+------------------------------------------------+",
"| true |",
"| true |",
"| false |",
"| false |",
"| false |",
"| false |",
"| true |",
"| true |",
"| true |",
"| true |",
"| true |",
"+------------------------------------------------+",
],
&result
);
// use sql and regexp_like function to test col 'values', against patterns in col 'patterns' with flags
let result = ctx
.sql("select regexp_like(values, patterns, flags) from examples")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+---------------------------------------------------------------+",
"| regexp_like(examples.values,examples.patterns,examples.flags) |",
"+---------------------------------------------------------------+",
"| true |",
"| true |",
"| true |",
"| false |",
"| false |",
"| false |",
"| true |",
"| true |",
"| true |",
"| true |",
"| true |",
"+---------------------------------------------------------------+",
],
&result
);
// literals work as well
// to match against the entire input use ^ and $ in the regex
let result = ctx
.sql("select regexp_like('John Smith', '^.*Smith$'), regexp_like('Smith Jones', '^Smith.*$')")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+---------------------------------------------------+----------------------------------------------------+",
"| regexp_like(Utf8(\"John Smith\"),Utf8(\"^.*Smith$\")) | regexp_like(Utf8(\"Smith Jones\"),Utf8(\"^Smith.*$\")) |",
"+---------------------------------------------------+----------------------------------------------------+",
"| true | true |",
"+---------------------------------------------------+----------------------------------------------------+",
],
&result
);
// look-around and back references are not supported for performance
// reasons.
// Note that an error may not always be returned but the result
// if returned will always be false
let result = ctx
.sql(r"select regexp_like('(?<=[A-Z]\w )Smith', 'John Smith', 'i') as a")
.await?
.collect()
.await;
assert!(result.is_ok());
let result = result.unwrap();
assert_eq!(result.len(), 1);
assert_batches_eq!(
&[
"+-------+",
"| a |",
"+-------+",
"| false |",
"+-------+",
],
&result
);
// invalid flags will result in an error
let result = ctx
.sql(r"select regexp_like('\b4(?!000)\d\d\d\b', 4010, 'g')")
.await?
.collect()
.await;
let expected = "regexp_like() does not support the \"global\" option";
assert_contains!(result.unwrap_err().to_string(), expected);
// there is a size limit on the regex during regex compilation
let result = ctx
.sql("select regexp_like('aaaaa', 'a{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}')")
.await?
.collect()
.await;
let expected = "Regular expression did not compile: CompiledTooBig";
assert_contains!(result.unwrap_err().to_string(), expected);
//
//
//regexp_match examples
//
//
// regexp_match format is (regexp_match(text, regex[, flags])
//
let _ = ctx.table("examples").await?;
// use sql and regexp_match function to test col 'values', against patterns in col 'patterns' without flags
let result = ctx
.sql("select regexp_match(values, patterns) from examples")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+-------------------------------------------------+",
"| regexp_match(examples.values,examples.patterns) |",
"+-------------------------------------------------+",
"| [a] |",
"| [A] |",
"| |",
"| |",
"| |",
"| |",
"| [010] |",
"| [Düsseldorf] |",
"| [Москва] |",
"| [Köln] |",
"| [اليوم] |",
"+-------------------------------------------------+",
],
&result
);
// use dataframe and regexp_match function to test col 'values', against patterns in col 'patterns' with flags
let result = ctx
.sql("select regexp_match(values, patterns, flags) from examples")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+----------------------------------------------------------------+",
"| regexp_match(examples.values,examples.patterns,examples.flags) |",
"+----------------------------------------------------------------+",
"| [a] |",
"| [A] |",
"| [B] |",
"| |",
"| |",
"| |",
"| [010] |",
"| [Düsseldorf] |",
"| [Москва] |",
"| [Köln] |",
"| [اليوم] |",
"+----------------------------------------------------------------+",
],
&result
);
// literals work as well
// to match against the entire input use ^ and $ in the regex
let result = ctx
.sql("select regexp_match('John Smith', '^.*Smith$'), regexp_match('Smith Jones', '^Smith.*$')")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+----------------------------------------------------+-----------------------------------------------------+",
"| regexp_match(Utf8(\"John Smith\"),Utf8(\"^.*Smith$\")) | regexp_match(Utf8(\"Smith Jones\"),Utf8(\"^Smith.*$\")) |",
"+----------------------------------------------------+-----------------------------------------------------+",
"| [John Smith] | [Smith Jones] |",
"+----------------------------------------------------+-----------------------------------------------------+",
],
&result
);
//
//
//regexp_replace examples
//
//
// regexp_replace format is (regexp_replace(text, regex, replace[, flags])
//
// use regexp_replace function against tables
let result = ctx
.sql("SELECT regexp_replace(values, patterns, replacement, concat('g', flags)) FROM examples")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+---------------------------------------------------------------------------------------------------------+",
"| regexp_replace(examples.values,examples.patterns,examples.replacement,concat(Utf8(\"g\"),examples.flags)) |",
"+---------------------------------------------------------------------------------------------------------+",
"| bbabbbc |",
"| B |",
"| aec |",
"| AbC |",
"| aBC |",
"| 4000 |",
"| xyz |",
"| München |",
"| Moscow |",
"| Koln |",
"| Today |",
"+---------------------------------------------------------------------------------------------------------+",
],
&result
);
// global flag example
let result = ctx
.sql("SELECT regexp_replace('foobarbaz', 'b(..)', 'X\\1Y', 'g')")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+------------------------------------------------------------------------+",
"| regexp_replace(Utf8(\"foobarbaz\"),Utf8(\"b(..)\"),Utf8(\"X\\1Y\"),Utf8(\"g\")) |",
"+------------------------------------------------------------------------+",
"| fooXarYXazY |",
"+------------------------------------------------------------------------+",
],
&result
);
// without global flag
let result = ctx
.sql("SELECT regexp_replace('foobarbaz', 'b(..)', 'X\\1Y')")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+--------------------------------------------------------------+",
"| regexp_replace(Utf8(\"foobarbaz\"),Utf8(\"b(..)\"),Utf8(\"X\\1Y\")) |",
"+--------------------------------------------------------------+",
"| fooXarYbaz |",
"+--------------------------------------------------------------+",
],
&result
);
// null regex means null result
let result = ctx
.sql("SELECT regexp_replace('foobarbaz', NULL, 'X\\1Y', 'g')")
.await?
.collect()
.await?;
assert_batches_eq!(
&[
"+---------------------------------------------------------------+",
"| regexp_replace(Utf8(\"foobarbaz\"),NULL,Utf8(\"X\\1Y\"),Utf8(\"g\")) |",
"+---------------------------------------------------------------+",
"| |",
"+---------------------------------------------------------------+",
],
&result
);
Ok(())
}