String regexStr = "+" // Regex to be matched // Step 1: Compile a regex via static method pile(), default is case-sensitive Pattern pattern = pile(regexStr) String inputStr = "abc00123xyz456_0" // Input String for matching See " Regular Expressions (Regex) in Java" for full coverage. ('abc*xyz*_*', 3) # Return a tuple of output string and count Code Example in Java # Try substitute with count: re.subn( regexStr, replacementStr, inStr) -> ( outStr, count) # Try substitute: re.sub( regexStr, replacementStr, inStr) -> outStr # r'.' denotes raw strings which ignore escape code, i.e., r'\n' is '\'+'n' > import re # Need module 're' for regular expression # Try find: re.findall( regexStr, inStr) -> matchedSubstringsList # Test under the Python Command-Line Interpreter Python also uses backslash ( \) for escape sequences (i.e., you need to write \\ for \, \\d for \d), but it supports raw string in the form of r'.', which ignore the interpretation of escape sequences - great for writing regex. See " Python's re module for Regular Expression" for full coverage. There are more than one ways to write a regex! Take note that many programming languages (C, Java, JavaScript, Python) use backslash \ as the prefix for escape sequences (e.g., \n for newline ), and you need to write "\\d+" instead.Ĭode Examples (Python, Java, JavaScript, Perl, PHP) Code Example in Python
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