{"id":2194,"date":"2014-04-14T11:16:48","date_gmt":"2014-04-14T11:16:48","guid":{"rendered":"http:\/\/blog.bachi.net\/?p=2194"},"modified":"2023-09-29T16:39:11","modified_gmt":"2023-09-29T16:39:11","slug":"regular-expression","status":"publish","type":"post","link":"https:\/\/blog.bachi.net\/?p=2194","title":{"rendered":"RegEx: Regular Expression"},"content":{"rendered":"

regexr<\/a>
\nregex101<\/a>
\nregextester<\/a><\/p>\n

A Practical Guide to Regular Expressions \u2013 Learn RegEx with Real Life Examples<\/a><\/p>\n

\r\nabc         Letters\r\n123         Digits\r\n\\.          Period\r\n\r\n[abc]       Only a, b, or c\r\n[^abc]      Not a, b, nor c\r\n[a-z]       Characters a to z\r\n[0-9]       Numbers 0 to 9\r\n\r\n{m}         m Repetitions\r\n{m,n}       m to n Repetitions\r\n*           Zero or more repetitions\r\n+           One or more repetitions\r\n?           Optional character\r\n.           Any Character\r\n\r\n^\u2026$         Starts and ends\r\n(\u2026)         Capture Group\r\n(a(bc))     Capture Sub-group\r\n(.*)        Capture all\r\n(abc|def)   Matches abc or def\r\n\r\n\\s          Any Whitespace\r\n[ ]         Whitespace\r\n\\S          Any Non-whitespace character\r\n\\d          Any Digit\r\n\\D          Any Non-digit character\r\n\\w          Any Alphanumeric character [a-zA-Z_0-9]\r\n\\W          Any Non-alphanumeric character\r\n\r\nNon-capturing group:\r\n(?:expression)\r\n\r\nLook-around assertions:\r\n(?<=expression) = positive look-behind assertion\r\n(?=expression)  = positive look-ahead assertion\r\n<\/pre>\n
<\/p>\n
Capture Groups<\/h4>\n
Capturing Groups and Backreferences<\/a>
\nWhat is a non-capturing group in regular expressions?<\/a><\/p>\n
The only difference between capture groups and non-capture groups is that the former captures the matched character sequences for possible later re-use with a numbered back reference while a non-capture group does not.<\/p><\/blockquote>\n
<\/p>\n
RegexOne – with Exercises<\/h4>\n
Lesson 11: Match groups \/ Capture group<\/a><\/p>\n
<\/p>\n
Exercise<\/h1>\n
<\/p>\n
List of single characters<\/p>\n
\n
\r\nFile:\r\nhat\r\ntut\r\ncat\r\nblue\r\nred\r\nzat\r\nbet\r\ntat\r\nmet\r\nmat\r\n\r\nRegEx:\r\n[htm]at => matches "hat", "tat", "mat"\r\n\r\nRegEx:\r\n[^htm]at => matches ".at" except "hat", "tat", "mat"\r\nResult: "cat", "zat"\r\n<\/pre>\n
<\/p>\n
Whitespace at the beginning or end of a line<\/h4>\n
\r\n^[ \\t]+|[ \\t]+$\r\n\r\nExplanation:\r\n^   Start of line\r\n[ ] List of single characters: Space and Tab\r\n+   One or more occurrences\r\n|   OR\r\n$   End of line\r\n<\/pre>\n
<\/p>\n
Remove newlines<\/h4>\n
\r\nFile:\r\naaa\r\nbbb\r\nccc\r\n\r\nRegEx: '(?<=^.+)\\n'\r\n\r\nResult:\r\naaabbbccc\r\n<\/pre>\n
<\/p>\n
Cut out only define name<\/h4>\n
\r\n#define DEFAULT_CLOCK_BLA                      MAC_ADD_HEAD_1,0xff,0xfe,MAC_ADD_HEAD_2,SR_NR\r\n<\/pre>\n
Remove #define:<\/p>\n
\r\nDEFAULT_CLOCK_BLA                      MAC_ADD_HEAD_1,0xff,0xfe,MAC_ADD_HEAD_2,SR_NR\r\n<\/pre>\n
\r\nSearch:  '(?<=(^[\\w]+))[\\s]*[\\w\\,]*(?=($))'\r\nReplace: ''\r\n<\/pre>\n
\r\nDEFAULT_CLOCK_BLA\r\n<\/pre>\n
<\/p>\n
Append parameter list<\/h4>\n
\r\ndefault_clock_bla\r\n<\/pre>\n
\r\nSearch:  '(?<=(^[\\w]+))\\s*(?=($))'\r\nReplace: '(void);'\r\n<\/pre>\n
\r\ndefault_clock_bla(void);\r\n<\/pre>\n
<\/p>\n
Trim to only have one space<\/h4>\n
\r\nbool                            default_clock_bla(void);\r\n<\/pre>\n
\r\nSearch:  '(?<=(^[\\w]+))\\s+'\r\nReplace: ' '\r\n<\/pre>\n
\r\nbool default_clock_bla(void);\r\n<\/pre>\n
<\/p>\n
Separate result type from function name<\/h4>\n
\r\nbool default_clock_bla(void);\r\n<\/pre>\n
\r\nSearch:  '(?<=(^[\\w]+))\\s'\r\nReplace: '\\n'\r\n<\/pre>\n
\r\nbool\r\ndefault_clock_bla(void);\r\n<\/pre>\n
<\/p>\n
Add curly brackets<\/h4>\n
\r\nbool\r\ndefault_clock_bla(void);\r\n<\/pre>\n
\r\nSearch:  ';(?=($))'\r\nReplace: '\\n{\\n    \\n}\\n'\r\n<\/pre>\n
\r\nbool\r\ndefault_clock_bla(void)\r\n{\r\n    \r\n}\r\n<\/pre>\n
<\/p>\n
Add  to every line<\/h4>\n
\r\nDEVICE_I2CSLAVE=1\r\nTARGET_LIKE_MBED\r\nDEVICE_PORTOUT=1\r\nDEVICE_PORTINOUT=1\r\nTARGET_RTOS_M4_M7\r\n<\/pre>\n
\r\nSearch:  '(?<=.*)^'\r\nReplace: '<name>'\r\n\r\nSearch:  '=1$'\r\nReplace: '<\/name><value>1<\/value>'\r\n<\/pre>\n
\r\n<name>DEVICE_I2CSLAVE<\/name><value>1<\/value>\r\n<name>TARGET_LIKE_MBED\r\n<name>DEVICE_PORTOUT<\/name><value>1<\/value>\r\n<name>DEVICE_PORTINOUT<\/name><value>1<\/value>\r\n<name>TARGET_RTOS_M4_M7\r\n<\/pre>\n
<\/p>\n
Add suffix if line-end is NOT “>”<\/h4>\n
\r\n<name>DEVICE_I2CSLAVE<\/name><value>1<\/value>\r\n<name>TARGET_LIKE_MBED\r\n<name>DEVICE_PORTOUT<\/name><value>1<\/value>\r\n<name>DEVICE_PORTINOUT<\/name><value>1<\/value>\r\n<name>TARGET_RTOS_M4_M7\r\n<\/pre>\n
\r\nSearch:  '(?<=[^>]$)'\r\nReplace: '<\/name><value\/>'\r\n<\/pre>\n
\r\n<name>DEVICE_I2CSLAVE<\/name><value>1<\/value>\r\n<name>TARGET_LIKE_MBED<\/name><value\/>\r\n<name>DEVICE_PORTOUT<\/name><value>1<\/value>\r\n<name>DEVICE_PORTINOUT<\/name><value>1<\/value>\r\n<name>TARGET_RTOS_M4_M7<\/name><value\/>\r\n<\/pre>\n
<\/p>\n
Embrace lines<\/h4>\n
\r\n<name>DEVICE_I2CSLAVE<\/name><value>1<\/value>\r\n<name>TARGET_LIKE_MBED<\/name><value\/>\r\n<name>DEVICE_PORTOUT<\/name><value>1<\/value>\r\n<name>DEVICE_PORTINOUT<\/name><value>1<\/value>\r\n<name>TARGET_RTOS_M4_M7<\/name><value\/>\r\n<\/pre>\n
\r\nSearch:  '^(?=<name>.*)'\r\nReplace: '<macro>\\n'\r\n\r\nSearch:  '(?<=.*<\/value>|<value\/>)'\r\nReplace: '\\n<\/macro>'\r\n<\/pre>\n
\r\n<macro>\r\n<name>DEVICE_I2CSLAVE<\/name><value>1<\/value>\r\n<\/macro>\r\n<macro>\r\n<name>TARGET_LIKE_MBED<\/name><value\/>\r\n<\/macro>\r\n<macro>\r\n<name>DEVICE_PORTOUT<\/name><value>1<\/value>\r\n<\/macro>\r\n<macro>\r\n<name>DEVICE_PORTINOUT<\/name><value>1<\/value>\r\n<\/macro>\r\n<macro>\r\n<name>TARGET_RTOS_M4_M7<\/name><value\/>\r\n<\/macro>\r\n<\/pre>\n
<\/p>\n
Table to SQL <\/h4>\n
Adding Quotation marks around string with regex<\/a><\/p>\n
\r\nJoy F 11 51.3 50.5\r\nJane F 12 59.8 84.5\r\nJim M 12 57.3 83.0\r\nAlice F 13 56.5 84.0\r\nJeff M 13 62.5 84.0\r\nBob M 14 64.2 90.0\r\nPhilip M 16 72.0 150.0\r\n<\/pre>\n
\r\nSearch:  '[ ]'\r\nReplace: ', '\r\n\r\nSearch:  '([^\\s,.0-9]+)'\r\nReplace: ''$1''\r\n<\/pre>\n
\r\n'Joy', 'F', 11, 51.3, 50.5\r\n'Jane', 'F', 12, 59.8, 84.5\r\n'Jim', 'M', 12, 57.3, 83.0\r\n'Alice', 'F', 13, 56.5, 84.0\r\n'Jeff', 'M', 13, 62.5, 84.0\r\n'Bob', 'M', 14, 64.2, 90.0\r\n'Philip', 'M', 16, 72.0, 150.0\r\n<\/pre>\n
\r\nSearch:  '(?<=^)'\r\nReplace: ') ,(\\n    '\r\n<\/pre>\n
\r\n) ,(\r\n    'Joy', 'F', 11, 51.3, 50.5\r\n) ,(\r\n    'Jane', 'F', 12, 59.8, 84.5\r\n) ,(\r\n    'Jim', 'M', 12, 57.3, 83.0\r\n) ,(\r\n    'Alice', 'F', 13, 56.5, 84.0\r\n) ,(\r\n    'Jeff', 'M', 13, 62.5, 84.0\r\n) ,(\r\n    'Bob', 'M', 14, 64.2, 90.0\r\n) ,(\r\n    'Philip', 'M', 16, 72.0, 150.0\r\n<\/pre>\n
<\/p>\n
Strip CC, only use source file<\/h4>\n
One-Liner<\/p>\n
\r\nOriginal: CC -m64 -instances=global   -c -fast -g0 -I\/opt\/include -o build\/testGlobals.o ..\/app\/testGlobals.cpp\r\nSearch:   ^.* (.*)$\r\nReplace:  $1\r\nResult:   ..\/app\/testGlobals.cpp\r\n<\/pre>\n
Multi-Liner<\/p>\n
\r\nmkdir -p build\/x86_Release \r\nCC  -c -fast -g0  -I\/opt\/include -o build\/x86_Release\/dynamoGlobals.o dynamoGlobals.cpp\r\nCC: Warning: -xchip=native detection failed, falling back to -xchip=generic\r\nmkdir -p build\/x86_Release \/_ext\/710760585\r\nCC  -c -fast -g0  -I\/opt\/include   -o build\/x86_Release\/_ext\/710760585\/TValueList.o ..\/dynamo_base\/TValueList.cpp\r\nCC: Warning: -xchip=native detection failed, falling back to -xchip=generic\r\nmkdir -p build\/x86_Release \/_ext\/710760585\r\nCC  -c -fast -g0  -I\/opt\/include   -o build\/x86_Release\/_ext\/710760585\/UProductConstructor.o ..\/dynamo_base\/UProductConstructor.cpp\r\nCC: Warning: -xchip=native detection failed, falling back to -xchip=generic\r\nmkdir -p build\/x86_Release \/_ext\/710760585\r\n<\/pre>\n
\r\nSearch:  '^(?!CC ).*$\\n?'\r\nReplace: ''\r\n\r\nSearch:  '^.* (.*)$'\r\nReplace: '$1'\r\n<\/pre>\n
\r\ndynamoGlobals.cpp\r\n..\/dynamo_base\/TValueList.cpp\r\n..\/dynamo_base\/UProductConstructor.cpp\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
regexr regex101 regextester A Practical Guide to Regular Expressions \u2013 Learn RegEx with Real Life Examples abc Letters 123 Digits \\. Period [abc] Only a, b, or c [^abc] Not a, b, nor c [a-z] Characters a to z [0-9] Numbers 0 to 9 {m} m Repetitions {m,n} m to n Repetitions * Zero or […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2194","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/2194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2194"}],"version-history":[{"count":24,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/2194\/revisions"}],"predecessor-version":[{"id":14254,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/2194\/revisions\/14254"}],"wp:attachment":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}