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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r""" ^Traceback [\s\S]+? (?=^\[|\Z) """, flags=re.MULTILINE | re.VERBOSE) test_str = ("Started by upstream project \"run_script\" build number 435\n" "originally caused by:\n" " Started by user test\n" "[Pipeline] {\n" "[Pipeline] stage (Svnup)\n" "Entering stage Svnup\n" "+ python -m test.cli install 479CI9SOZ android://0.0.0.0:10000/479CI9SOZ /root/workspace/group/apk/com.data.app.apk - - false false\n" "[03:21:33][DEBUG]<android> /root/env/common/test/test/core/android/adb/linux/adb -H 0.0.0.0 -P 10000 -s 479CI9SOZ wait-for-device\n" "Traceback (most recent call last):\n" " File \"/usr/lib/python2.7/runpy.py\", line 174, in _run_module_as_main\n" " \"__main__\", fname, loader, pkg_name)\n" " File \"/usr/lib/python2.7/runpy.py\", line 72, in _run_code\n" " exec code in run_globals\n" " File \"/root/env/common/test/test/cli/parser.py\", line 55, in main\n" " run_script(args)\n" " File \"/root/env/common/test/test/core/helper.py\", line 224, in wrapper\n" " return f(pictarget, *args[1:], **opargs)\n" " File \"/root/env/common/test/test/core/main.py\", line 408, in assert_exists\n" " raise AssertionTimeout(\"%s does not exist in screen\" % v)\n" "AssertionTimeout: MoaPic(group_login.owl/tpl1487844291185.png) does not exist in screen\n" "EndOfStream\n" "[03:23:18][DEBUG]<android> /root/env/common/test/test/core/android/adb/linux/adb -H 0.0.0.0 -P 10000 -s 479CI9SOZ forward --remove tcp:12671\n" "+ python -m test.cli run 479CI9SOZ android://0.0.0.0:10000/479CI9SOZ /root/workspace/group/util/scripts/group_login.owl \n" "rpc_uri: http://0.0.0.0:12708/jsonrpc/0\n" "rpc_uri: http://0.0.0.0:12708/jsonrpc/0\n" "Traceback (most recent call last):\n" " File \"/usr/lib/python2.7/runpy.py\", line 174, in _run_module_as_main\n" " \"__main__\", fname, loader, pkg_name)\n" " File \"/usr/lib/python2.7/runpy.py\", line 72, in _run_code\n" " exec code in run_globals\n" " File \"/root/env/common/test/test/__main__.py\", line 5, in <module>\n" " main()\n" " File \"/root/env/common/test/test/cli/parser.py\", line 55, in main\n" " run_script(args)\n" " File \"/root/env/common/test/test/cli/runner.py\", line 124, in run_script\n" " exec_script(args.script, scope=globals(), root=True)\n" " File \"/root/env/common/test/test/cli/runner.py\", line 186, in exec_script\n" " exec(compile(code, scriptpath, 'exec')) in scope\n" " File \"/root/env/common/mator/mator/mator.py\", line 520, in start\n" " raise IOError(\"RPC server not started!\")\n" "IOError: RPC server not started!\n" "[03:24:40][DEBUG]<android> /root/env/common/test/test/core/android/adb/linux/adb -H 0.0.0.0 -P 10000 -s 479CI9SOZ forward --remove tcp:12708\n" "[03:26:41][DEBUG]<main> ->sift result: None\n" "[03:26:41][DEBUG]<main> match result: None\n" "Traceback (most recent call last):\n" " File \"/usr/lib/python2.7/runpy.py\", line 174, in _run_module_as_main\n" " \"__main__\", fname, loader, pkg_name)\n" " File \"/usr/lib/python2.7/runpy.py\", line 72, in _run_code\n" " exec code in run_globals\n" " File \"/root/env/common/test/test/core/main.py\", line 195, in touch\n" " pos = loop_find(v, timeout=timeout)\n" " File \"/root/env/common/test/test/core/utils/logwraper.py\", line 70, in wrapper\n" " res = f(*args, **kwargs)\n" " File \"/root/env/common/test/test/core/cv.py\", line 83, in loop_find\n" " raise NotFoundException('Picture %s not found in screen' % query)\n" "test.core.error.NotFoundException: 'Picture MoaPic(group_login.owl/tpl1482311722698.png) not found in screen'\n" "+ python -m test.cli stop_screen_record android://0.0.0.0:10000/479CI9SOZ 479CI9SOZ.mp4\n" "ERROR: script returned exit code 1\n" "Finished: FAILURE") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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