Regular Expressions 101

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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

/
/
gu

Test String

Code Generator

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"(?<=^|[\n;](?:[\t ]*(?:\w+ )?)?)export\s*(?<modifiers>(?:\s*declare|\s*abstract|\s*async)+)?\s*(?<declaration>class|const +enum|const|enum|function\*?|interface|let|namespace|type(?! *\{)|var)\s+(?<exports>(?:[$_\p{ID_Start}][$\u200C\u200D\p{ID_Continue}]*(?=[\s=:;/({])(?!.*?,))|(?:[\w\t\n\r .,:$'\"=-]+)|(?:[{[][\w\t\n\r .,:$'\"-]+[}\]]))(?:\s*=\s*[$_\p{ID_Start}][$\u200C\u200D\p{ID_Continue}]*)?" test_str = ("export const CJS_SYNTAX_REGEX: RegExp = /pattern/gm;export const IGNORE_PATTERNS: string[] = [];\n" "export declare const RESOLVE_EXTENSIONS: string[]\n" "export enum Snack{}\n" "export const enum Snack {}\n" "export interface User {}\n" "export class House {}\n" "export declare abstract class House extends Building {}\n" "export abstract class House {}\n" "export async function run() {}\n" "export async function* run() {}\n" "export function foo() {}\n" "export function* foo() {}\n" "export const $foo = 42\n" "export const $foo= 42\n" "export namespace Foo {}\n" "export type Foo = 'foo'\n" "export let name1, name2/*, … */; // also var\n" "export const name1 = 1, name2 = 2/*, … */; // also var, let\n" "export function functionName() { /* … */ }\n" "export class ClassName { /* … */ }\n" "export function* generatorFunctionName() { /* … */ }\n" "export const { name1, name2: bar } = o;\n" "export const [ name1, name2 ] = array;\n\n" "declare module 'module-name' {\n" " export declare abstract class Building {}\n" " export declare class House extends Building {}\n" "}\n\n" "\"export const $foo = 42\"\n\n" "export default async function functionName() { /* … */ }\n" "export default function functionName() { /* … */ }\n" "export default function* generatorName() { /* … */ }\n" "export default async function* generatorNameAsync() { /* … */ }\n" "export default class ClassName { /* … */ }\n" "export default abstract class ClassName { /* … */ }\n\n" "export default function () { /* … */ }\n" "export default async function () { /* … */ }\n" "export default function* () { /* … */ }\n" "export default async function* () { /* … */ }\n" "export default class { /* … */ }\n\n" "export default async () => {}\n" "export default async arg => {}\n" "export default () => {}\n" "export default arg => {}\n" "export default (arg) => {}\n\n" "export default foo\n" "export default foo;\n" "export default 1 + 1;\n\n" "// export const CJS_SYNTAX_REGEX\n\n" "/**\n" " * Resolvable file extensions.\n" " *\n" " * @example\n" " * export const CJS_SYNTAX_REGEX\n" " */\n\n" "export type Foo = 'foo'") matches = re.finditer(regex, test_str, re.UNICODE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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 Python, please visit: https://docs.python.org/3/library/re.html