re.match(pattern,text) -> searches for the pattern only in the beginning of the string.

This file, covers the following topcis -

• Difference between raw string and python string.
• match method in re library
• how to write unit test

re.search(pattern,text) -> returns the first match in the text. re.findall(pattern,text) -> returns a list of all the matches. re.findieter(pattern,text) -> returns an iterator

This file,covers the following topic -

• search method in re, and how its different from match
• findall mehod
• finditer, and how it covers up the possible disadvantage of findall
• groups, and how we can name the groups.

re.sub(pattern, replacement pattern / function, text) -> returns the text where the string matching the pattern is replaced by a string given by the replacement pattern / function

This file covers the following topic-

• using re.sub with a pattern
• using re.sub with a user defined function
• re.split

This file covers the following topic -

• searching for a single character, and making the search case insensitive.
• Using range of characters to search, eg, [a-z]
• Using wildcard .(dot) to find all characters also, how can we search if we want to search a dot.
• Finding newlines, using hexadeciaml code and unicode.

This file covers the following topic -

• searching for a given word (using word boundary)
• searching for a word at beginning of a string ( by using '^' )
• enabling multiline mode and searching for a word at the beginning of all lines.
• searching for a word at the end of a string (by using '$' )
• enabling multiline mode and searching for a word at the end of all lines

This file covers the following topic -

• searching for word digits using \d character class
• searching digits in other scripts than english
• using negation \D
• seaching for alpa numeric characters using \w
• using \w in devnagari script
• using the negation of \w, which is \W

This file covers the following topics -

• Searching words with custom matches like -
  • aplhabet followed by a digit
  • alphabet followed by zero or more digit
  • alphabet followrd by one or more digit
  • two alphabets followed by one or more digits