Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

r"
"
gm

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "闹钟|叫.{0,3}[|早|醒|我|起]+"; final String string = "叫一下我\n" + "叫一下醒\n" + "叫我一下醒\n" + "叫醒服务。\n" + "明天早上六点叫我起床。\n" + "叫早。\n" + "嗯，明天五点叫醒啊。\n" + "嗯，明天早上七点半叫醒一下。\n" + "嗯，四点半叫醒好。\n" + "给我ianoncall。\n" + "嗯，明天想有个叫早叫醒服务。\n" + "就是定个闹钟，早上五点。\n" + "八点半叫醒。\n" + "早上九点叫醒。\n" + "嗯，我想说叫早。\n" + "嗯，下午六点下午四点三十五叫醒，谢谢。\n" + "七点十五分叫醒确定吗，确定吗？\n" + "嗯，可以帮我设置一个叫醒服务吗？\n" + "亲，明天早上五点叫醒。\n" + "的，明天早上帮我叫醒。\n" + "一点十五叫我起床。\n" + "六点半叫我起床。\n" + "嗯，早上六点叫我起床。\n" + "嗯，我想明天早上六点半叫早。\n" + "这个明天早上叫早二零八。\n" + "我想提供一个叫醒服务。\n" + "一个叫醒服务。\n" + "您好，有叫醒服务吗？\n" + "六点半叫醒。\n" + "你好，明天给我叫醒三点叫醒好吧。\n" + "哎，你好，我要一个明天早上六点的叫早服务。\n" + "八点的叫醒。\n" + "预定明天早上的早餐一个。\n" + "哎，你好，明天早上麻烦你叫一下我。\n" + "你们哪六点叫醒吗？谢谢啊。\n" + "叫早服务。\n" + "我要叫醒服务。\n" + "嗯，那个你两室一个是能不能叫个早？\n" + "我想订闹钟。\n" + "嗯，十一点半叫我起床。\n" + "嗯，明天五点半叫醒我。\n" + "好，麻烦您帮我设置一下叫醒服务。\n" + "明天早上能不能叫醒啊？\n" + "嗯，明天早上帮您看八点半。\n" + "嗯嗯，下午六点钟叫我一下。\n" + "四点半叫我起床，四点半。\n" + "请明天早上七点十分来一个叫醒服务。\n" + "帮我预约明天早上七点的叫醒。\n" + "您这早上五点三十分叫醒。\n" + "那个八六零，我这里是明天早上六点二十叫醒服务。\n" + "明天早上给我一个叫醒。\n" + "帮我订一个二十七号下午三点的叫醒。\n" + "啊，早上七点三十叫醒。\n" + "明天上午七点三十分叫早六一九号房。\n" + "您好，明天五点五十叫醒服务。\n" + "哎，你这样你明天早上给我一个叫醒好吗？\n" + "嗯，给我的那个定明天早上的闹钟。\n" + "帮我定明天早上三点的叫醒。\n" + "明天早上叫醒。\n" + "五点的叫醒服务，帮忙给我改一下改成五点半的。\n" + "预约一个叫早服务。\n" + "嗯，你好，麻烦明天早上八点叫醒一下。\n" + "哎，成交服务叫醒服务。\n" + "嗯，帮我订一个八点和八点五十的叫醒。\n" + "啊，喂，你好，能帮我那个明天早上七点半叫醒我吧。\n" + "嗯，你好，我想要一个明天早上六点钟的叫醒服务。\n" + "嗯，叫醒。\n" + "嗯，需要帮我设置叫早服务。\n" + "啊，明天早上帮我叫起好吗？\n" + "哎，明天早上七点四十莫林。\n" + "可以帮我设置莫林扣吗？\n" + "六点十八分叫醒我号码。\n" + "嗯，叫醒服务是吧？\n" + "嗯，明天八点早上叫醒我可以吗？\n" + "明天上午七点叫起叫醒。\n" + "嗯，那个明天早上叫一个叫醒。\n" + "你凌晨叫醒。\n" + "嗯，明天叫醒服务啊？\n" + "叫醒？\n" + "明天早上七点半叫醒。\n" + "明天早上五点叫醒一下。\n" + "嗯，明天那个五点十五分叫醒。\n" + "订个五点的叫醒服务。\n" + "设置明天早上六点五十的叫醒服务。\n" + "明天早上五点叫我一下吧。\n" + "取消叫早。\n" + "叫一个莫林？\n" + "你好，明天早上请帮我叫一下早。\n" + "嗯，帮我订一个八点五十的叫早。\n" + "加钱那个叫醒服务。\n" + "明天，明天叫醒。\n" + "有一个今天下午三点的叫醒。\n" + "八点叫醒。\n" + "请帮我订一个叫醒闹钟。\n" + "七幺七，明天早上八点叫醒。\n" + "五点半叫醒。\n" + "呃，给我设一个叫醒服务。\n" + "明天早上五点半叫醒我。\n" + "嗯，给我的订一个叫醒服务。\n" + "嗯，四点钟叫醒。\n" + "我您call。\n" + "那个给我弄个七点十分的叫醒吧。\n" + "嗯，明天早晨六点五十分叫醒。\n" + "嗯，下午五点的叫醒。\n" + "六点五十分叫醒。\n" + "明天早上六点四十叫醒。\n" + "嗯，你好，麻烦你叫我管管官家。\n" + "嗯，叫醒服务。\n" + "明天七点的叫醒我。\n" + "呃，我要明天早上来个叫醒。"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html