regex101: PCRE (Legacy) Match Workspace

Character Class[$]

$the literal $ (36₁₀ / 44₈ / 24₁₆)

Group 1([{])?

?repeats the group contents below at most once:

Character Class[{]

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Group 2([0-9]+)?

?repeats the group contents below at most once:

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Condition(?(2)|(?:TM_FILENAME))

Uses the first branch if group 2 matched

If the condition is true, match this branch: — matches an empty string

Otherwise, match this branch:(?:TM_FILENAME)

Non-Capturing Group(?:TM_FILENAME)

TM_FILENAMEthe literal text TM_FILENAME (case sensitive)

Condition(?(1)(?(2)[:].+|[\/].+[\/].*[\/])})

Uses the first branch if group 1 matched

If the condition is true, match this branch:(?(2)[:].+|[\/].+[\/].*[\/])}

Condition(?(2)[:].+|[\/].+[\/].*[\/])

Uses the first branch if group 2 matched

If the condition is true, match this branch:[:].+

Character Class[:]

:the literal : (58₁₀ / 72₈ / 3A₁₆)

.+any character (except for line terminators), repeated at least once

Otherwise, match this branch:[\/].+[\/].*[\/]

Character Class[\/]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.+any character (except for line terminators), repeated at least once

Character Class[\/]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*any character (except for line terminators), repeated any number of times

Character Class[\/]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Search reference

Regular Expression

[$]([{])?([0-9]+)?(?(2)|(?:TM_FILENAME))(?(1)(?(2)[:].+|[\/].+[\/].*[\/])})

New

If-Then-Else Conditionals in Regular Expressions
http://www.regular-expressions.info/conditional.html

$TM_FILENAME            //GOOD
$1                      //GOOD
${1:}                   //BAD: empty default value
${1:a}                  //GOOD
${TM_FILENAME/[\.]/_/}  //GOOD
${TM_FILENAME:a|b}      //BAD: cannot set default value to static var
${TM_FILENAME/}         //BAD: illegal: only one `/` (need3)
${TM_FILENAME/a/}       //BAD: illegal: only two `/` (need3)
${TM_FILENAME/a//}      //GOOD: not empty between first two `/` 
${TM_FILENAME//abc/}    //BAD: this should not match: empty between first two `/` 
${TM_FILENAME/a//a}     //BAD: not `}` after last `/`

Regular Expressions 101

Regular Expression

Extraction