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

r"
"
gmx

Test String

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r""" ^Traceback [\s\S]+? (?=^\[|\Z) """ 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 = re.finditer(regex, test_str, re.MULTILINE | re.VERBOSE) 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